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904 - Double Deflection Adjustable Aluminum Blade Grille For a 20" x 8" Duct Opening (front blades parallel to shortest dimension)
INSTALLATION INSTRUCTIONS
remove the two center cones as a unit and reposition the six screws
SUBMITTAL 2720 Series Submittal
Dampers above 80 square inches free area will be provided with blade insulation
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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