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Control, Balancing & Backdraft Dampers

Nailor offers a comprehensive line of damper products for airflow control in commercial and industrial HVAC systems. Our Wind Tunnel & Damper Testing Laboratory has established the company as an industry leader for testing our products to the latest version of AMCA, UL, ANSI, and other industry standards of performance.

1020 Low Leakage Control Damper

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.

2020 High Performance Control Dampers

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.

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.

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.

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.

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.