The retaining angles on both sides of the fire damper may be inverted in order to accomodate a register or grille.
Duct fire damper installation.
Fasteners may be used as followed.
Remove the fasteners from the damper connect it to the duct through these holes and into the drilled holes and tighten.
These holes should line up with the pre drilled holes on the damper.
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.
Above with a maximum of two 10 sheet metal screws on each side and on.
Duct sleeve connections listed in ul 555 sixth edition standard for fire dampers 2.
Open up the duct work and drill two holes on opposite edges of the tube.
Joints using connections shown in 1.
Then seal both sides with duct tape.
Cut out the section where you plan to install your air duct damper with your tin snips fix the section of duct you removed back in place pop your air damper in between these duct sections position the junction box so it covers the electrical wires going to the power source per manufacturer s instructions.
Wall rating 2 hr.