4 1/4" Vertical Mount Fire Damper 2633-30X10 T-Bar 3/4" round collar

3/4" round collar

Nylon bushings on adjustable blades to prevent metal on metal rattle

904 - Double Deflection Adjustable Aluminum Blade Grille For a 18" x 14" Duct Opening (front blades parallel to shortest dimension)

Standard Features * Full size fixed bar blade T-Bar lay-in return air grille *

Double deflection radius mount spiral pipe grille with adjustable blades

4 1/4" Vertical Mount Fire Damper 2633-30X10 T-Bar 3/4" round collarh3. 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