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955 Series Engineering/Performance Data
904 - Double Deflection Adjustable Aluminum Blade Grille For a 20" x 20" Duct Opening (front blades parallel to shortest dimension)
Back blades are parallel to the longest dimension
Designed for protection of ceiling openings in fire rated floor/ceiling assemblies with fire resistance ratings of 3 hours or less
Spiral pipe diameter must be 4” larger than Height of the duct opening
Architectural Lattice Grilles 1301-28x6 Finish:MBlack 955 Series Engineering/Performance DataStandard Features 1 rim size (2 larger than nominal duct size order size) 14 gauge steel construction Countersunk mounting holes for a flush appearance 1 27 32 x 11 32 slots. 5 32 crossbars, with 75% free area Options 14 GA 304 SS Construction Fractional Sizes Tamper proof Screws *Pricing is based on standard 14 GA steel construction. Please contact us for a quote on options. tony@registers direct. com
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