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904 - Double Deflection Adjustable Aluminum Blade Grille For a 24" x 4" Duct Opening (front blades parallel to shortest dimension)
Louvers designed with rolled rib for maximum strength and rigidity
22 gauge galvanized steel roll formed frame
450 Series Submittal
Installation Ring only
2" Round Horizontal/Vertical Mount Fire Damper 2550-12 Smoke-Fire Damper 904 - Double Deflection AdjustableStandard Features Spring actuated curtain type fire damper with 2 1 4" round connection for horizontal or vertical mount 2" thin line roll formed out of airstream frame Designed for use in walls, floors and partitions with fire resistance ratings of 2 hours or less (for ceiling application, see 2700 series) UL listed and tested in accordance with UL Standard 555 1 1 2 hour fire resistance rating Building materials rated 2 hours or less CSFM California
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