4 1/4" Vertical Mount Fire Damper 2633-48X20 past 12 months 1/4” crossbars

1/4” crossbars

102 P - two way

Blades are parallel to the longest dimension

Filter retention tabs

4 1/4" Vertical Mount Fire Damper 2633-48X20 past 12 months 1/4” crossbarsh3. 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