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Ships within 48 hours · Estimated delivery Aug 10 - Aug 15
1 1/2 hour fire resistance rating
Installation Ring only
Designed for high volume air delivery
904 - Double Deflection Adjustable Aluminum Blade Grille For a 24" x 4" Duct Opening (front blades parallel to shortest dimension)
Tamper Proof Screws - stainless steel TORX Center Pin
2" Round Horizontal/Vertical Mount Fire Damper 2550-12 Smoke-Fire Damper 1 1/2 hour fire resistanceStandard 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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