4" 3 Hour Vertical Mount Fire Door 2661-8X8 Smoke-Fire Damper UL listed and tested in

UL listed and tested in accordance with UL Standard 555C

SD34 - Transition Box Spiral Pipe Grille (DOUBle Deflection)

Standard Features * Fixed bar blades parallel to 1st dimension given *

104 P - four way * Square to round No Labor Collar * 2x2 galvaneal steel panel with seismic support holes * Soft White Options * 104 P D - multi-shutter damper with hinged perforated face * 104 P O - steel opposed blade damper with hinged perforated face * 104 P FR - U

4" 3 Hour Vertical Mount Fire Door 2661-8X8 Smoke-Fire Damper UL listed and tested inh3. Standard Features * 2661 Square or rectangular fire door for vertical mount only. Maximum dimension 60x60. For damper free area chart A click here * 2663 Out of Airstream fire door. Square or rectangular for vertical mount only. Maximum dimension 60w x 52h. For damper free area chart B click here * 2665 Round fire door for vertical mount only. Available 4" thru 52" round. * 3 hour rated * UL and California State Fire Marshall approved * 4 1 4"