4 1/4" Vertical Mount Fire Damper 2633-20X10 Commercial Opposed Blade Damper standard on

Opposed Blade Damper standard on 4" widths

904 - Double Deflection Adjustable Aluminum Blade Grille For a 18" x 12" Duct Opening (front blades parallel to shortest dimension)

57% free area * 1307: 13/16" lattice opening

Adjustable directional dampers with shut-off

Countersunk mounting holes for a flush appearance

4 1/4" Vertical Mount Fire Damper 2633-20X10 Commercial Opposed Blade Damper standard onh3. 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