4" Horizontal/Vertical Mount Fire Damper 2634-40X8 Residential Registers & Grilles NGD - Narrow ceiling grid

NGD - Narrow ceiling grid dimples for 9/16" T-Rails

listed Fire-Resistance Diffusers * TVB - Thermal Vapor Blanket * Square collar

Adjustable curved blade diffuser

Narrow ceiling grid dimples for 9/16" T-Rails

055 T6 aluminum surface mount return air grille * 45 fixed blades parallel to shortest dimension * Countersunk mounting holes for flush appearance with color matching Phillips posi-drive screws * Soft White Options * 906 O - recessed screwdriver operated opposed blade damper * No Labor Collar (square sizes only) * 900 T - T-Bar mount * 905 HD - reinforced construction * 905 IS - insect screen * 1335-1338 Series - stainless steel version * Fractional

4" Horizontal/Vertical Mount Fire Damper 2634-40X8 Residential Registers & Grilles NGD - Narrow ceiling gridh3. 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