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104 D FR - U
Zinc plated steel closure spring
Extruded aluminum frame with steel roll formed blades and steel multi-shutter damper
Ceramic fiber blade insulation with fiberglass cover*
enclosed in valve to assure trouble-free operation
4 1/4" Vertical Mount Fire Damper 2633-36X14 Step Down Ceiling Diffuser 104 D FR - Uh3. 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
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