The assembly consists of two one-inch fiberboard plenum boxes sized to match the diffuser neck, interconnected by a flexible duct sized per plans. A transfer air grille is installed at the ceiling penetration. The installation accommodates either a T-bar lay-in ceiling or a surface-mounted gypsum board ceiling as indicated on plans.
CEILING T-BAR LAY-IN CEILING OR SURFACE MOUNT AT GYPSUM BOARD CEILING SEE PLANS FOR SIZE FLEX DUCT 1" FIBERBOARD PLENUM BOX SAME SIZE AS DIFFUSER NECK 1" FIBERBOARD PLENUM BOX SAME SIZE AS DIFFUSER NECK TRANSFER AIR GRILLE SEE PLANS
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