Mechanical · M-TJM86

Horizontal Fire Damper Installation at Floor Assembly

Materials

Elements

Doors Floors / Slabs Connections / Plates Roof / Floor Openings

About this detail

A horizontal fire damper is installed within a factory sleeve penetrating a UL-rated floor assembly. Minimum one-and-one-half-inch retaining angles are positioned on all four sides at both the top and bottom of the floor, overlapping the structural opening by at least one inch while leaving corners covered. The retaining angles are secured to the factory sleeve using number ten sheet metal screws at eight inches on center with a minimum of two connections per side, left unfastened to the floor. A minimum one-quarter-inch clearance is maintained on all sides between the sleeve and the floor opening unless manufacturer recommendations require more. Breakaway duct connections are utilized on both sides, paired with a factory access door.

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