For use in low to medium velocity and pressure commercial HVAC systems. Galvanized, aluminum, Type 304 stainless steel optional. Variety of electric two position, modulating, and pneumatic factory actuators available.

Nailor high performance control dampers are ideal for use in high velocity, medium pressure commercial and industrial HVAC systems. Standard features include a rugged galvanized steel hat channel frame with superior structural strength, no-maintenance concealed linkage located out of the airstream, totally enclosed within the damper frame, and heavy duty airfoil blades that combine superior rigidity and deflection resistance with low pressure drop. Extruded aluminum airfoil blade models with optional insulated blades and/or frame available.  

Highly accurate and responsive Air Measuring Control Dampers use thermal dispersion probes and control dampers that continuously read and control the airflow. These units reduce energy and maintenance costs, improves indoor air quality, and aids in ASHRAE 62.1 compliance. The AMD series may be used in any commercial ducted application, with common applications being outside air intake and floor supply/return tracking. The rugged and hermetically sealed probes boast 2% sensor accuracy and aerodynamic apertures that straighten the airflow for an improved reading. Featuring an easy to read, back-lit, color display and intuitive, menu-driven interface, the Electra- flo transmitter has BACnet MS/TP and Modbus RTU communication capabilities that allow for remote monitoring and operation.

Nailor 1500 Series Heavy Duty Control Dampers feature heavy duty galvanized steel U-channel frames, adjustable face linkage, and stainless steel pivot pins which results in smooth operation and easy maintenance. Designed for "in-duct" mounting applications to control airflow and provide positive shut-off. Dynamic limitations: Pressure: 2.9-20.1" w.g. and Velocity: 3000-3500 fpm (Vee Blade Models) and Pressure 10.0-32.0" w.g. and Velocity: 4000-6000 (Airfoil Blade Models)

Nailor Balancing Dampers are ruggedly built and designed for manual balancing applications. They are a cost effective and reliable damper for reduced volume control and offer an economical manufactured product alternative to custom ‘shop built’ dampers. Not intended for use in shut-off or actuated applications.

The backdraft dampers in this series are gravity operated and are for use in light, medium and heavy duty commercial or light duty industrial HVAC applications. They allow airflow to pass in one direction and to prevent it in the opposite direction. They are constructed from corrosion resistant extruded aluminum.

Standard and high performance counterbalanced backdraft dampers are designed to automatically prevent the backflow of air while allowing for automatic air intake or exhaust/pressure relief in medium duty and heavy duty commercial and light industrial HVAC applications are available. Corrosion-resistant extruded aluminum construction highlights the model’s features, which include a reinforced mitered corner frame that resists racking and aerodynamic blades that overlap the jambs for maximum weather protection. Extruded PVC blade seals provide quiet closure as well as extra weather protection. 

The CVR constant volume regulator is an extremely cost-effective way to precisely control the airflow of the HVAC systems – especially high rise buildings - without the need for on-site electric or pneumatic controls or sensors. A self-regulating blade and spring piston adjust automatically to maintain a constant set airflow volume. They adjust automatically for variable duct pressures caused by building pressure, thermal stack effect, dust buildup and other variable adverse conditions.

Nailor ​1910/1920 Series Industrial Control Dampers are designed for use in medium to high pressure systems with velocities up to 3500 fpm (18 m/s) and pressure differentials up to 20" w.g. (5 kPa). Nailor 1970/1980 Series Industrial Control Dampers are designed for use in high pressure systems with pressure differentials of up to 34" w.g. (8.5 kPa) and velocities up to 6000 fpm (30 m/s).

Nailor’s industrial backdraft dampers are designed to prevent the backflow of air while allowing for automatic air intake or exhaust in industrial HVAC or process air systems.

D1250 Series Multi-Blade Dynamic Fire Dampers provide 1 1/2 hour UL labeled fire protection suitable for use where ductwork penetrates a wall or floor with a fire resistance rating of up to 2 hours. Nailor’s most popular and economical design features sturdy vee groove style blades and a rugged mitered corner hat channel frame design that virtually eliminates racking. The over-center/knee lock with high torque spring/fusible link assures fail-safe closure during fire conditions under airflow. The D1250 series is approved for use in both static and dynamic HVAC system designs, and is an economical and versatile performer, available with a factory fitted sleeve and choice of transition styles, suitable for use in the majority of today's commercial applications.

Model 1290F is an economical true round fire damper designed and qualified for point-of-origin fire containment where round ductwork passes through metal stud drywall partitions or masonry walls that have a fire resistance rating of up to 2 hours and building codes require a fire damper. Features include the industry proven over-center/knee lock design with high torque spring/fusible link closure which provides fail-safe security during fire conditions under airflow. Each damper is supplied as standard with retaining plates for fast secure installation and a hand locking quadrant which holds the damper in the fully open position, but may also be used for system balancing if required. Stainless Steel model with Type 304 Stainless Steel standard, or Type 316 optional, available.

Nailor 1280 Series Aluminum Airfoil Blade Smoke Dampers are the premium choice for applications where building codes require a leakage rated smoke damper as part of a static smoke control or dynamic smoke management system. The 1280 Series features a smoothly contoured extruded aluminum airfoil blade and compression type seals that have been especially designed to offer the lowest leakage class available. Together with out of airstream linkage, the design provides an ultralow pressure drop and minimizes unwanted turbulence and noise generation.

1210 Series Smoke Dampers feature an innovative inter-locking double skin steel airfoil blade design that eliminates the need for combustible blade seals that typically burn off during fire conditions. The unique blade design combines high performance and low pressure drop while providing complete flame and smoke seal. Available at standard dynamic velocity/pressure ratings of 2000 fpm @ 4" w.g. (10 m/s @ 1 kPa), UL tested for extended ratings up to 4000 fpm @ 8" w.g. (20 m/s @ 2 kPa), Model Series 1210 has been designed and tested to provide premium performance. Features include an economical steel airfoil blade, low pressure drop frame design and maintenance free concealed blade linkage for superb air performance, turbulence and noise.

Model Series 1210M Modulating Smoke Dampers are classified for use as a volume control damper in applications where building codes require a leakage rated smoke damper.  They are equipped with a modulating actuator.  

1210SS Series Stainless Steel Airfoil Blade Smoke Dampers are ideal for high humidity, mildly corrosive or, with optional Type 316 construction, more severe environment applications where building codes require a leakage rated damper for operational smoke control in static or dynamic smoke management systems. 1210SS Series dampers are designed and tested to provide premium performance and offers the lowest leakage class available, qualified for installation with airflow in either direction and inverted mounting. Features include a stainless steel airfoil blade, low pressure drop frame design and maintenance free concealed blade linkage for superb air performance, minimal turbulence and noise.

Model Series 1210VB Vertical Blade Smoke Damper is a high performance smoke damper that provides superior protection and versatility. The vertical blade configuration allows for the actuator to be mounted below the damper and is ideal for applications where bottom access is desired or where there isn’t space for a side mounted actuator

Model Series 1220 and 1220-3 Combination Fire/Smoke Dampers provide the ultimate in fire containment and smoke control for both static and dynamic smoke management systems. They utilize an innovative inter-locking double-skin airfoil blade design that provides a flame and smoke seal, eliminating the need for synthetic blade seals which burn out during fire conditions, and maintains its leakage class up to 2000°F (1093°C) - a feature no other fire/smoke damper in the industry can offer! Ideal for use where building codes require both a fire damper to protect ductwork penetrations in fire separations and a leakage rated damper for use in smoke management systems, it is available with Leakage Class I or II at 250°F (121°C) or 350°F (177°C). Available at standard dynamic velocity/pressure rating of 2000 fpm @ 4" w.g. (10 m/s @ 1 kPa), UL tested with extended ratings up to 4000 fpm (20 m/s) and 8" w.g. (2 kPa). Model Series 1220 and 1220-3 have been specially designed and tested to provide premium performance and are AMCA licensed. Qualified for installation with airflow in either direction and inverted mounting.

Model Series 1220SS and 1220SS-3 Combination Fire/Smoke Dampers are ideal for high humidity, mildly corrosive environment applications where building codes require both a fire damper for the protection of ductwork penetrations in walls and a leakage rated damper for operational smoke control on static or dynamic smoke management systems. Features include an airfoil blade, low pressure drop frame design, and maintenance free concealed blade linkage for superb air performance and minimal turbulence and noise. Optional Type 316 Stainless Steel construction is available for more severe environment applications.

Models 1221-DOW and 1221-OW are "out of wall" high performance combination fire/smoke damper specifically designed for applications where the damper cannot be installed within the plane of the wall or floor. They features Nailor’s unique inter-locking double skin airfoil blade design that eliminates combustible seals and provides flame and smoke seal under fire conditions at temperatures up to 2000°F (1093°C)! Model 1221-DOW is designed for ducted through penetrations where as Model 1221-OW is designed for applications that terminate at a grille and provide easy actuator access.

This "3-in-1" damper provides volume control via an electric or pneumatic modulating actuator as well as fire and smoke control for "out of wall" applications.

Model 1221G is a high performance combination fire/smoke damper specifically designed for supply or return ducts that terminate at a grille. The factory sleeve with unique 3/4" (19) grille mounting tabs simplifies installation, saves on field labor and eliminates the requirements for unsightly front retaining angles which commonly protrude from behind the grille. A steel grille installs over and completely hides the mounting tabs. The damper is offset in the sleeve to accommodate a single or double deflection supply air grille, single deflection supply air register or a return air grille or register.

Models 1221C-1, 1221C-2 and 1221C-4 Airfoil Blade Tunnel Corridor Combination Fire/Smoke Dampers are for use where ductwork penetrates the ceiling of an interior corridor of a building, creating a horizontal opening that requires protection. Model 1221C-1 and 1221C-4 are suitable for use with a steel grille or diffuser when the duct terminates at the ceiling. 1221C-4 includes grille side access to the actuator. Model 1221C-2 is suitable for use when the duct is required to continue down past the ceiling level. Each unit is supplied factory mounted in a suitable sleeve complete with upper retaining angles. Model 1221C-3 is both a 1 hr. rated Corridor Damper for use in corridor ceilings and a standard 1 1/2 hr. rated Combination Fire/Smoke Damper for use in walls and floors. The dual rating makes it ideal for stocking as the unit can be supplied when either type of damper is required by the local customer.

Model Series 1220M and 1220M-3 "3-in-1" Modulating Fire/Smoke Dampers have been engineered to provide premium containment in fire and smoke conditions. The addition of volume control using a modulating actuator eliminates the need and cost of a separate control damper.  

Model 1221VB is a high performance combination fire/smoke damper that provides superior protection and versatility. The vertical blade configuration allows for the actuator to be mounted below the damper and is ideal for applications where bottom access is desired or where there is not enough space for a side mounted actuator.

Electric Actuators for use with Nailor Operable Louvers, Control, Smoke, and Combination Fire/Smoke Dampers. Model types include Two Position Spring Return, Modulating Spring Return, and Modulating Non-Spring Return.

Electric Actuators for use with Nailor Combination/Operable Louvers, Control, Smoke, and Combination Fire/Smoke Dampers. Model types include Two Position Spring Return and Modulating Spring Return.

Electric and Pneumatic actuators for use with Nailor Combination/Operable Louvers, Control, Smoke, and Combination Fire/Smoke Dampers. Model types include Two Position Spring Return, Modulating Spring Return, and Modulating Non-Spring Return.

Series D0100 (steel) and D0100SS (stainless steel), Curtain Fire Dampers, designed for use in dynamic "fans on" systems where the HVAC system remains operational in the event of a fire, are UL approved for use where building codes require protection of HVAC ductwork penetrations in walls, partitions or floors that have a fire resistance rating of 2 hours or less. The D0100 Series features stainless steel closure springs for assured damper closure under airflow. 

Nailor D0104-1X Series Integral Sleeve Dynamic Curtain Fire Dampers include an integral roll formed 4 1/4" frame and sleeve in a single unit. These dampers are a cost effective solution within a limited size and sleeve length range. Stainless steel closure springs for assured closure under airflow and corrosion resistant steel frame and blades for lasting performance. 

Series D01X4HY Hybrid Fire Dampers are designed for larger duct sizes that exceed the size limitations of dynamic curtain fire dampers and are a more economical solution than a multi-blade fire damper. The D01X4HY Hybrid Dynamic Fire Dampers are UL approved for use where local building codes require the protection of HVAC ductwork penetrations in walls and partitions that have a fire resistance rating of up to 2 hours. The D01X4HYs are classified for use in dynamic "fans on" systems where the HVAC system remains operative in the event of a fire and damper closure under airflow is assured. Integral sleeve fire dampers offer convenience and labor savings. The costly requirement to field or shop fabricate custom sleeves is eliminated and dampers ship directly from the manufacturer to the job site – saving time and money. Optional "Quick-Set" retaining angles complete the installation package. Factory fabricated, sized and shipped with damper, they install quickly, provide further labor savings and eliminate the need for any field fabrication.  

D0100G Series Dynamic Curtain Fire Dampers are designed for use in conjunction with a steel grille when ductwork terminates at an opening in a fire rated wall/partition. This unique product utilizes special grille mounting tabs on the sleeve that eliminates the requirement for unsightly retaining angles which commonly protrude from behind the grille. A steel grille installs over and completely conceals the mounting tabs for a clean, aesthetic finish. The fire damper is offset in the sleeve to accommodate a single or double deflection supply air grille, single deflection supply air register or a return air grille or register. Countersunk screw holes in the grille frame will match to mounting tabs when a Nailor grille is ordered in conjunction with the damper assembly.

Model D0110DOW, D0110GOW, D0120GOW are "out of wall or floor" integral sleeve dynamic curtain type fire dampers. Model D0110GOW and D0120GOW are designed for supply or return ducts that terminate at a grille or register. Model D0110DOW is designed for through penetrations (ductwork connected to both sides) where the damper cannot be installed within the plane of the wall. UL approved for use where local building codes require the protection of HVAC ductwork penetrations in walls, partitions or floors that have a fire resistance rating of up to 2 hours. These dampers are particularly suited for use in common steel stud drywall partition designs as narrow as 3 1/2" (89), where a traditional "within the plane of the wall" fire damper installation is not possible.

0100 (steel) and 0100SS (stainless steel) Series Static Curtain Fire Dampers, for use in static "fans off" systems where the HVAC system shuts down in the event of a fire, are UL approved to provide protection of HVAC ductwork penetrations in walls, partitions or floors that have a fire resistance rating of 2 hours or less.

Nailor 0104-1X Series Integral Sleeve Static Curtain Fire Dampers include an integral roll formed 4 1/4" frame and sleeve in a single unit. These dampers are a cost effective solution within a limited size and sleeve length range. Corrosion resistant steel frame and blades for lasting performance.

Series 0200V/H Thinline Frame Static Curtain Fire Dampers are UL approved for use where building codes require the protection of HVAC ductwork penetrations in walls, partitions or floors that have a fire resistance rating of 2 hours or less, classified for use only in static "fans off" systems where the HVAC system is automatically shut down in the event of a fire alarm. Series 0200 Thinline Frame Dampers are only 2" (51) deep making them ideal for installation in narrow fire rated partitions, transfer duct openings, behind grilles or in any other application where space is limited.

Model 0310V/H Wide Frame Static Curtain Fire Damper is UL approved for use where local building codes require the protection of HVAC ductwork penetrations in walls, partitions or floors that have a fire rating of 2 hours or less, classified for use only in static "fans off" systems where the HVAC system is automatically shut down in the event of a fire alarm. The wide frame allows for fewer blades and is ideal for use when maximum free area is desired in situations where space or design does not yield room for a Type B damper style.

0100G, 01X4G and 0200G Series Integral Sleeve Static Curtain Fire Dampers are designed for use in conjunction with a steel grille when ductwork terminates at an opening in a fire rated separation. This unique product utilizes special grille mounting tabs on the sleeve that eliminate the requirement for unsightly retaining angles which commonly protrude from behind the grille. The steel grille installs over and completely conceals the mounting tabs for a clean, aesthetic finish. 1 1/2 hour rated for use in 2 hour fire separations or less, classified for use in static "fans off" systems where the HVAC system shuts down in the event of a fire alarm. 

Models 0110DOW, 0110GOW and 0120GOW are "out of wall or floor" integral sleeve static curtain type fire dampers.  Model 0110GOW and 0120GOW are specifically designed for supply or return ducts that terminate at a grille or register. Model 0110DOW is designed for through penetrations (ductwork connected to both sides) where the damper cannot be installed within the plane of the wall. For use where local building codes require the protection of HVAC ductwork penetrations in walls, partitions or floors that have a fire resistance rating of up to 2 hours. These dampers are classified for use only in static "fans off" systems where the HVAC system is automatically shut down in the event of a fire alarm. These models are particularly suited for use in common steel stud drywall partition designs, as narrow as 3 1/2" (89) where a traditional "within the plane of the wall" fire damper installation is not possible.

Model 0130GC has been specially designed for garbage chute applications. The damper casing is oversized to ensure that the blade stack, fusible link and closure springs are unobstructed from falling waste. The round collar is slightly oversized for direct attachment to the outside of the garbage chute. The design features corrosion resistant steel construction and 100% free area and is available in three standard sizes, 20" dia. (508), 22" dia. (559) and 24" dia. (610), as well as custom sizes.

Nailor D1200 and D1200-3 Series Airfoil Multi-blade Fire Dampers provide the ultimate in fire containment for both static and dynamic HVAC systems. The design utilizes an innovative inter-locking double skin airfoil blade that maintains a complete barrier throughout the fire test with absolutely no visible through-gaps. Amazingly, the damper gets tighter as it gets hotter! Ideal for use where building codes require a fire damper for the protection of ductwork penetrations in walls or floors with a low pressure drop design suitable for high velocity applications. Premium performance, versatility and assured closure under airflow make the D1200 and D1200-3 series dampers an excellent choice for the majority of today’s commercial applications.

Nailor D1200SS and D1200SS-3 Series Stainless Steel Airfoil Multi-blade Fire Dampers provide the ultimate in fire containment for both static and dynamic HVAC systems, ideal for use high humidity or corrosive environments where building codes require a fire damper for the protection of ductwork penetrations in walls or floors. Available in either Type 304 or 316 Stainless Steel, premium performance, rugged construction and assured closure under airflow make the D1200SS and D1200SS-3 series dampers an excellent choice for the majority of today’s commercial and light industrial applications.

Model D1201-OW and D1201-DOW are "out of wall" high performance dynamic fire dampers. They offer premium performance and a low pressure drop well suited to the majority of commercial applications. Unique, inter-locking double skin blade design eliminates combustible seals and provides flame protection under fire conditions at temperatures up to 2000°F (1366°C). Model D1201-OW design allows for through the grille access to the damper actuator and other components.  Model D1201-DOW is ideal for applications where the damper cannot be installed with the plane of the wall or floor.

Nailor 1200 and 1200-3 Series Airfoil Multi-blade Fire Dampers are classified for use only in static "fans off" systems where the HVAC system is automatically shut down in the event of a fire alarm. Largest fire damper listing in the industry (exceeding curtain dampers) at 144" x 96" (3658 x 2438). Standard features include an innovative inter-locking double skin airfoil blade design that maintains a complete barrier throughout the fire test with absolutely no visible through-gaps. The airfoil blade design and elimination of blade sills, top and bottom, provide a low pressure drop design. The 1200 and 1200-3 Series dampers have been especially designed and tested to provide premium performance.

Nailor 1200SS and 1200SS-3 Series Stainless Steel Airfoil Multi-blade Fire Dampers are classified for use only in static "fans off" systems where the HVAC system is automatically shut down in the event of a fire alarm. The 1200SS and 1200SS-3 series dampers have been designed and tested to provide premium performance, available in either Type 304 or 316 Stainless Steel, ideal for use in high humidity and mildly corrosive environments where building codes require a fire damper for the protection of ductwork penetrations in walls or floors. The airfoil blade design and elimination of blade sills, top and bottom, provide a low pressure drop design.

Nailor Model 0722 Ceiling Dampers are for use in round applications, in lieu of hinged door type dampers in any UL/ULC floor/ceiling or roof/ceiling assembly with up to a 3 hour fire resistance rating where air ducts are allowed. Exteneded collar models 0722-SE and 0722-LE available. Adjustable models 0722A, 0722A-SE, and 0722A-LE available.

Models 1201-MDG and 1201-MDS are Multi-Blade Low Leakage Fire Dampers for use in marine applications which require USCG approval for installation on Class A-60 divisions. Unique airfoil blade design provides low pressure drop, particularly suited for high velocity applications. Standard features include a rugged hat channel frame, 12" (305) factory fitted sleeve, concealed in-frame linkage and stainless steel jamb seals for low leakage performance. Models 1201-MDG and 1201-MDS may be installed vertically, with blades running horizontal, or horizontally.

Model Series 1270 combination fire/smoke dampers, with sturdy veegroove style blades and a rugged mitered corner hat channel frame design that virtually eliminates racking, provides 1 1/2 hour UL labeled fire protection suitable for use where ductwork penetrates a wall or floor with a fire resistance rating of 2 hours or less. The 1270 Series is UL tested and labeled for use as a Class I or II Leakage Rated Damper for smoke control applications in both static or dynamic HVAC system designs. Available with factory fitted sleeve (Model 1271), and a variety of actuators and options to suit each application, the 1270 series is a versatile and economical performer suitable for most commercial applications.

Model 1271G is a combination fire/smoke damper specifically designed for supply or return ducts that terminate at a grille. The sleeve with unique 3/4" (19) grille mounting tabs simplifies installation, saves on field labor and eliminates the requirements for unsightly front retaining angles which commonly protrude from behind the grille. A steel grille installs over and completely hides the mounting tabs. The damper is offset in the sleeve to accommodate a single or double deflection supply air grille, single deflection supply air register or a return air grille or register.

Models 1271C-1 and 1271C-2 Tunnel Corridor Combination Fire/Smoke Dampers are for use where ductwork penetrates the ceiling of an interior corridor of a building, creating a horizontal opening that requires protection. Model 1271C-1 is suitable for use with a steel grille or diffuser when the duct terminates at the ceiling. Model 1271C-2 is suitable for use when the duct is required to continue down past the ceiling level. Each unit is supplied factory mounted in a suitable sleeve complete with upper retaining angles. Model 1271C-3 is both a 1 hr. rated corridor damper for use in corridor ceilings and a standard 1 1/2 hr. rated combination fire/smoke damper for use in walls and floors. The dual rating makes it ideal for stocking as the unit can be supplied when either type of damper is required by the local customer.

D0500 (steel) and D0500SS (stainless steel) Series, Dynamic Curtain Fire Dampers are UL approved for use where building codes require protection of HVAC ductwork penetrations in walls, partitions or floors that have a fire resistance rating of 4 hours or less. Classified for use in dynamic systems where the HVAC system remains operative in the event of a fire. The D0500 Series features stainless steel closure springs for assured damper closure under airflow, corrosion resistant steel frame and blades for lasting performance, and choice of transition styles and factory installed sleeves to suit duct size, making installation fast and simple.

Model series 0500 (steel) and 0500SS (stainless steel), Standard Frame Static Curtain Fire Dampers, for use in static "fans off" systems where the HVAC system shuts down in the event of a fire, are UL approved to provide protection of HVAC ductwork penetrations in walls, partitions or floors that have a fire resistance rating of 4 hours or less. The 0500V/H Series features corrosion resistant steel frame and blades for performance that will last and a choice of transition styles and factory installed sleeves to suit duct size, making installation fast and simple.

Model 0540V Wide Frame Static Curtain Fire Damper is UL approved for use where building codes require the protection of HVAC ductwork penetrations in vertical fire separations (walls or partitions) that have a fire resistant rating of 4 hours or less. The 0540 is classified for use in static "fans off" systems where the HVAC system is automatically shut down in the event of a fire and is ideal for applications where maximum free area is desired, in situations where space or design does not yield room for a Type B damper style. The design includes corrosion resistant steel frame and blades for lasting performance and is available with factory installed sleeve for fast and simple installation.

Models 0570V, 0580V and 0590V Thinline Static Curtain Fire Dampers are UL approved for use where building codes require the protection of HVAC ductwork penetrations in vertical fire separations (walls or partitions) that have a fire resistance rating of 4 hours or less, classified for use in static "fans off" systems where the HVAC system is automatically shut down in the event of a fire alarm. These thinline dampers are only 2" (51) deep, making them ideal for installation in narrow fire rated partitions, transfer duct openings, behind grilles or any other application where room is limited. They feature corrosion resistant steel frame and blades for lasting performance and a choice of transition styles and factory installed sleeves to suit duct size, making installation fast and simple.

Nailor 1260 Series Smoke Dampers are a ruggedly built economical choice for use where a smoke barrier has been penetrated by ductwork or where a leakage rated smoke damper is required in a static or dynamic smoke control system. The 1260 Series dampers are classified to UL Standard 555S Class I or II at 250°F (121°C) or 350°F (177°C) Elevated Temperatures, and are available with type B and C enclosures for small sizes and round ductwork. Design features include an economical steel vee groove style blade design that provides unmatched strength and durability, low pressure drop frame design and maintenance free concealed blade linkage for superb air performance, minimal turbulence and noise.

Nailor Round Industrial Control and Isolation Dampers are designed to provide tight shutoff with very low leakage in HVAC or industrial process control systems. A variety of optional features allow them to be tailored to the application.

Models 0755(A) and 0756(D) Ceiling Radiation Dampers have been designed and tested for simple installation in specific UL design wood truss ceiling assemblies. They are UL Classified for use in specific 1 hour rated UL floor /ceiling and roof/ceiling designs. Model 0755 ships complete with thermal blanket and top inlet round duct connection. Model Series 0756 features a factory provided sheet metal plenum for steel grille/diffuser mount or ducted applications with duct collar(s). Models 0757-CB/-DB/-EB and 0763-FB/-GB come with a variety of plenum options or steel grille/diffuser mount applications. Models 0755/0755A are listed for UL designs L528/L546/L550/L558/L562/L574/L576/L579/L581/L583/L585/L592/M501/M503/M526 and roof/ceiling design numbers P531/P533/P538/P545/P547/P549/P552/P570/P580. Models 0756/0756D are listed for UL designs L528/L546/L550/L558/L562/L574/L576/L579/L581/L583/L585/M501/M503 and roof/ceiling design numbers P531/P533/P538/P545/P547/P552. Models 0757-CB/-DB/-EB and 0763-FB/-GB are listed for UL designs L528/L546/L550/L558/L574/L576/L579/L581/L583/L585/M503 and roof/ceiling design numbers P531/P533/P545/P547/P552.

Nailor 0757, 0757D, and 0763 Ceiling Dampers for use in Wood Truss ceilings are component dampers for use with field fabricated plenums (by others). Models 0757/0757D are listed for UL designs L528/L546/L550/L558/L562/L574/L576/L579/L581/L583/L585/M501/M503 and roof/ceiling design numbers P531/P533/P538/P545/P547/P552. Model 0763 is listed for UL designs L528/L546/L550/L558/L574/L576/L579/L581/L583/L585/M503 and roof/ceiling design numbers P531/P533/P545/P547/P552.  

Model 1290S is a True Round Smoke Damper ideal for round ductwork applications where building codes require a leakage rated smoke damper for operational smoke control in static or dynamic smoke management systems. Features include a sturdy beaded casing for superior rigidity and a heavy duty 14 ga. (2.0) equivalent laminated blade that is double bolted to axles for positive connection. The 1290S smoke damper is designed and tested to provide premium performance and offers the lowest leakage class available, qualified for installation with airflow in either direction and inverted mounting.

Nailor ceiling dampers, or ceiling radiation dampers as they are commonly called, are designed to function as a fire and heat barrier in air duct openings penetrating fire resistive membrane ceilings. Models 0716, 0716A and 0714 are for use in square or rectangular applications, in lieu of hinged door type dampers in any UL floor/ceiling or roof/ceiling assembly with up to a 3 hour fire resistance rating where air ducts are allowed.

Nailor 0716-4 is ideal for installation in tight places that require a fire and heat barrier in air duct openings penetrating fire resistive membrane ceilings. Adjustable model 0716-4A for volume control available. Model 0720 ceiling radiation damper, which functions as a fire and heat barrier in air duct openings that penetrate fire resistive membrane ceilings, is for use in lieu of hinged door type dampers in any UL floor/ceiling assembly with up to a 3 hour fire resistance rating where air ducts are permitted.

Nailor’s True Round Combination Fire/Smoke Damper, Model 1290FS, is ideal for round duct applications where building codes require both a fire damper for the protection of ductwork penetrations in walls or floor that have a fire resistance rating of up to 2 hours and a leakage rated damper for operational smoke control on static or dynamic smoke management systems. Model 1290FS is an economical round combination fire/smoke damper designed and qualified for round ductwork passing through metal drywall partitions or masonry walls. Features of the damper include a sturdy beaded casing for superior rigidity and factory supplied retaining plates for fast, secure installation. The 1290FS offers the lowest leakage class available, Leakage Class I or II at 250°F (121°C) or 350°F (177°C), and is approved for vertical or horizontal installation.

Models 0725 and 0726 Thermal Blankets are designed to insulate the exposed back pan area of a steel ceiling diffuser that may be used in UL Classified floor/ceiling or roof/ceiling assemblies with up to a 3 hour rating. The insulation protects the floor/roof structure above from the intense heat that radiates through the diffuser pan during fire conditions. A thermal blanket is used in conjunction with a ceiling radiation damper that protects the neck opening of the diffuser, to provide complete protection of the opening in the ceiling membrane. Model 0725 thermal blanket is for use with 0722 ceiling damper models in round neck applications. Model 0726 thermal blanket is for use with 0714, 0716 and 0720 ceiling damper models in square neck applications.

Damper Control Panels, Duct Smoke Detectors, Position Indicators and Reopenable Fire Sensors for Fire/Smoke, Smoke and Control Dampers

These economical quality access doors meet SMACNA requirements for systems up to 2" w.g. (500 Pa) and provide quick, simple installation wherever duct access is required; available in 20 sizes to meet all access requirements. Design features include a rugged die-formed 22 ga. (0.85) frame and double skin door panels for extra strength, camlock operation for positive seal and easy opening and notched knock-over tabs for a clean and easy installation.

The Nailor 0800 Series Flat Oval duct access doors are engineered to provide a premium quality, ultra-low leakage door with optimum ergonomics in mind. The unique oval shape was designed after careful study of the needs of site engineering and maintenance personnel. Each door allows a different degree of access, enabling the most appropriate unit to be specified, depending on duct size and likely maintenance requirements. The 0800 Series is available in two frame styles for use with steel duct: a double flange screw hole mounting type (M1) or a knock-over tab type (M2). Both styles come with a simple installation cut-out template which makes the oval shape openings extra easy to cut.

Nailor Model 0800-5 Access Door was designed for use in higher pressure applications, yet it is suitable for use in medium and low pressure applications where the security of a positive pressure type access door is desired. The design of the 0800-5 is such that as positive static pressure in the duct increases, the force exerted on the door compresses the seal, eliminating any leakage possibilities. The ultra-low leakage design features include rugged die-formed construction, safety handles for assured opening and closing, and wing nut fasteners for secure attachment and alignment.

Models 0840-6, 0850-2L/R, and 0855-2L/R ultra-low leakage plenum access door provides easy access to larger plenums and equipment housings and is suitable for use in high, medium or low pressure applications. Design features include positive seal gasketing and insulation which provide assured low-leakage performance. The die-formed frame, hinged door and die-cast closure handles provide extra strength and maximum operational convenience. Thermal break 0850 and 0855 Series models available.

Nailor Model 0890 is an economical round duct access door suitable for use in low pressure applications. A durable hinge permits the heavy duty 16 ga. (1.6) door to swing open fully, allowing unobstructed access to the duct, while the zinc plated strikes and catches and polyurethane foam gasketing provide a tight, positive seal when closed. Model 0895 turret style access doors provide heavy duty construction with easy opening, suitable for use in medium and high pressure round duct systems. Features include an all-welded turret box and saddle formed to duct radius, and a high-pressure 0800 Series access door that is caulked and fastened to turret. Zinc plated progressive camlocks and bulb type door gasket provide a secure, tight seal.

Nailor Model 0900-1 fire-rated access door is for use whenever it is necessary to provide service access to utilities located within fire separations such as corridor walls, stairwells and ceilings. The 2" (51) thick insulation, which acts as a heat barrier, is also ideal for reducing sound transmission through access opening. The flush key operated latch provides convenient and secure opening and closing. Model 0900-2 is a multi-purpose access door designed to provide convenient access to utilities contained within walls or ceilings. This versatile access door installs flush in drywall, masonry block or tile, and plaster walls and ceilings with a clean unobtrusive finish. Both models are offered in an array of standard sizes, with special sizes available upon request.