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Dynamic
Nailor D1200(-3), D1250, and 1290F Series Dynamic Multi-Blade and Round Fire Dampers are classified for use in dynamic systems where the HVAC system remains operative in the event of a fire and may be installed in vertical walls or partitions, or horizontally in floors or assemblies.
Nailor D1200(-3) Series Dynamic Multi-Blade Fire Dampers feature an airfoil blade design that, coupled with the elimination of top and bottom blade sills, provide a low pressure drop design. Qualified to 4000 fpm (20 m/s) and 4 in. w.g. (1 kPa) and may be installed in vertical walls or partitions, or horizontally in floors. 1 ½ hour or 3 hour label models available.
Nailor D1250 Series Dynamic Multi-Blade Fire Dampers feature a traditional vee blade design and is suited to the majority of low velocity/pressure commercial applications. Qualified to 4000 fpm (20 m/s) and 4 in. w.g. (1 kPa) and may be installed in vertical walls or partitions, or horizontally in floors or assemblies with fire resistance ratings up to 2 hours.
Nailor Model 1290F and 1290F-SS are economical true round fire dampers designed and qualified specifically for point-of-origin fire containment where round ductwork passes through metal or wood stud drywall partitions and masonry walls or floors with fire resistance ratings up to 2 hours.