Duct sleeve connections listed in ul 555 sixth edition standard for fire dampers 2.
Duct fire damper installation.
2 1 2 stud or runner 1 2 gypsum wallboard retaining angle damper sleeve fire damper duct 1 2 thick filler pieces 2 1 2 wide to be installed around.
These holes should line up with the pre drilled holes on the damper.
Then seal both sides with duct tape.
The retaining angles on both sides of the fire damper may be inverted in order to accomodate a register or grille.
Wall rating 2 hr.
Fire damper installation operation maintenance instructions iom fire dampers 0718 nca manufacturing inc.
Open up the duct work and drill two holes on opposite edges of the tube.
Detail of opening preparation and fire damper installation.
Optional installation where the damper is larger than the opening in the floor and the damper is mounted on the bot tom side of the floor a minimum of 11 2 x 11 2 x 20 gage steel 38 x 38 x 1 0 mounting angle is required on the top.
Remove the fasteners from the damper connect it to the duct through these holes and into the drilled holes and tighten.
Joints using connections shown in 1.