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904 - Double Deflection Adjustable Aluminum Blade Grille For a 20" x 12" Duct Opening (front blades parallel to shortest dimension)
Standard collar diameter is the same as the diffuser size
T-20 Tamper Proof Screws
Square collar designed for 22" x 22" duct
Retainer cables are provided on sizes 12" and larger to allow the inner cones to hang securely while adjusting the diffuser
2" Vertical Mount Fire Damper 2533-10X6 Accessories 904 - Double Deflection Adjustableh3. Standard Features * 2533 Square or rectangular for vertical mount only. Maximum dimension 48w, 41h. * 2534 Square or rectangular spring actuated (6) for horizontal or vertical mount. Maximum dimension 41w, 29h. * UL and California State Fire Marshall approved * 2" thinline frame * Interlocking steel roll formed blade (3) with roll formed frames (1) * Blade lock (5) * Damper manufactured from corrosion tested galvanized mild steel (G 90) * Self
