4" Horizontal/Vertical Mount Fire Damper 2634-12X8 Smoke-Fire Damper 904 - Double Deflection Adjustable

904 - Double Deflection Adjustable Aluminum Blade Grille For a 30" x 30" Duct Opening (front blades parallel to shortest dimension)

UL listed and tested in accordance with UL Standard 555

* UL and California State Fire Marshall approved * 4-1/4" standard frame style * Maximum dimension 60w

Standard Features * 1" rim size (2" larger than nominal duct size) * 14 gauge steel * 1305: 1/2" lattice opening

3-way register with stiffened 1/2" fan shaped louvers for silent operation

4" Horizontal/Vertical Mount Fire Damper 2634-12X8 Smoke-Fire Damper 904 - Double Deflection Adjustableh3. Standard Features * 2633 Square or rectangular out of airstream fire damper for vertical mount only. * 2634 Square or rectangular Spring actuated (6) out of airstream fire damper for horizontal or vertical mount. * UL and California State Fire Marshall approved * 4 1 4" standard frame style * Maximum dimension 60w, 52h * Interlocking steel roll formed blade (3) with roll formed frames (1) * Blade lock (5) * Damper manufactured from corrosion