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904 - Double Deflection Adjustable Aluminum Blade Grille For a 20" x 8" Duct Opening (front blades parallel to shortest dimension)
PERFORMANCE DATA
Holds up to a 4" filter (not included) with filter retention tabs (FG4)
Standard Features * Extruded aluminum construction with steel multi-shutter damper * Margin edges are 7/8" projection for baseboard installation * Nylon bushings for easy adjustment and quiet setting of airfoil blades running parallel to shortest dimension * Countersunk mounting holes for flush appearance
SUBMITTAL 2720 Series Submittal
3-Hour Curtain Ceiling Radiation Damper 2720 Residential Registers & Grilles 904 - Double Deflection AdjustableStandard Features Square or rectangular ceiling radiation curtain type damper for horizontal mounting Designed for protection of ceiling openings in fire rated floor ceiling assemblies with fire resistance ratings of 3 hours or less UL listed and tested in accordance with UL Standard 555C 3 hour fire resistance rating Building materials rated 3 hours or less CSFM California State Fire Marshal listed 22 gauge steel blades with an insulated blanket
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