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904 - Double Deflection Adjustable Aluminum Blade Grille For a 20" x 20" Duct Opening (front blades parallel to shortest dimension)
Nylon bushings on adjustable blades prevent metal on metal rattle
see 2700 series)
Zinc plated steel closure spring
REVIT FILES Spiral Diffuser Radius Flush Mount Diffuser Single Deflection
4 1/4" Vertical Mount Fire Damper 2633-36X14 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
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