An acoustical return air elbow duct is routed between a floor assembly and a ceiling, featuring internal acoustical lining to reduce noise transmission. The duct incorporates an "A" by "B" transfer opening and a return air grille opening with minimum dimensions "C" and "D". The framed opening for the grille must be coordinated with the architectural floor assembly.
"C" MIN "D" MIN R/A GRILLE OPENING CEILING ACOUSTICAL LINING COORDINATE FRAMED OPENING WITH ARCHITECTURAL FLOOR ASSEMBLY "A" X "B" TRANSFER OPENING
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