Fire Damper Requirements Rated Floor Assemblies

Ul certifies all five of these types of dampers in accordance with the requirements in building codes.

Fire damper requirements rated floor assemblies. The fusible link holding the damper open is visible inside the top of the damper unit. This includes fire smoke combination fire smoke ceiling radiation and corridor dampers. Damper dimensional data duct transition connections dibd2 ow and dibd2ss ow dampers may be supplied. Building code requirements.

For damper styles wr wc wo and bc only the duct connection portion extends through the wall and the damper assembly is mounted flush with the wall. The section details the procedures for calculating fire resistance of walls floor ceiling and roof ceiling assemblies. That is why a fire damper rated for 1 5 hours can be used in a fire barrier rated for up to 2 hours and a fire damper rated for 3 hours can be used in a fire barrier rated up to four hours. Fire rated wood frame wall and floor ceiling assemblies.

The total fire rating is determined by adding each component to reach a minimum total of 60 minutes. Elements of buildings the fire resistance rating classifies the ability of an assembly to confine and isolate fire within a zone comprised of fire resistance rated walls ceiling and floor assemblies. For occupancies such as stores apartments of fices and other commercial and industrial uses build ing codes commonly require floor ceiling and wall assemblies to be fire resistance rated in accordance with standard fire tests. Protect openings for heating ventilation and air conditioning hvac ducts through these rated assemblies.

Fire protection rating is calculated from the flame side of the assembly and of course some assemblies have multiple flame sides. Fire dampers are installed in penetrations of fire rated walls and floors as required by the building code and access to the damper itself is normally through an improperly sized access door. The standard location permits the damper to be installed outside the plane of the wall or floor. Static and dynamic closure fire dampers.

Ducts that penetrate fire rated assemblies are not required to have dampers under section 716 need to be fire stopped per an approved fire rated assembly 713 3 ducts air transfer openings shall not penetrate exit enclosures and exit passageways unless they are necessary for independent pressurization. Photo 2 shows a fire damper unit that has been installed in a twohour rated masonry wall.