An air transfer duct transitions through a gypsum ceiling via a matching plaster frame. The interior of the duct is lined with a one-inch acoustical liner. The assembly interfaces with the return air ceiling plenum below the primary structure.
PROVIDE PLASTER FRAME FOR GYP CEILING GRILLE AND DUCT SIZE EQUAL TO DUCT SIZE 1" ACOUSTICAL LINER STRUCTURE RETURN AIR CEILING PLENUM
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