4" Horizontal/Vertical Mount Fire Damper 2634-22X10 past 12 months available 4" through 40" round

available 4" through 40" round (2549)

Square collar designed for 22" x 22" duct

Double deflection transition box mount spiral pipe grille

904 - Double Deflection Adjustable Aluminum Blade Grille For a 24" x 4" Duct Opening  (front blades parallel to shortest dimension)

3/4” Wide x 3/4” High square holes

4" Horizontal/Vertical Mount Fire Damper 2634-22X10 past 12 months available 4" through 40" roundh3. 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