4" Horizontal/Vertical Mount Fire Damper 2634-48X22 Step Down Ceiling Diffuser 904 - Double Deflection Adjustable

904 - Double Deflection Adjustable Aluminum Blade Grille for a 48" x 18" Duct Opening (front blades parallel to shortest dimension)

UL listed and tested in accordance with UL Standard 555

2550 Series Engineering/Performance Data

Standard Features * T-Bar lay-in panel with perforated face * 2x2 galvaneal steel panel with seismic support hangers * Round No Labor Collar attached to panel * Soft White Options * 105 P D - multi-shutter damper with hinged perforated face * 105 P O - opposed blade damper with hinged perforated face * TVB - Thermal Vapor Blanket * Square collar

102 PC - corner

4" Horizontal/Vertical Mount Fire Damper 2634-48X22 Step Down Ceiling Diffuser 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