Mechanical · M-SSHBD

Detail - Ceiling Return/Exhaust Grille

Materials

Elements

Beams Ceilings Trusses Connections / Plates

About this detail

A soundlined sheet metal plenum box connects to an insulated flexible duct and terminates at a ceiling return or exhaust grille above the finished ceiling. The flexible duct is installed with the inner duct stretched taut to five feet maximum length, secured with a three-eighths inch bead on the duct collar with a clamp and duct sealer. Two plenum box supports and a seismic restraint secure the plenum box directly to the top chord of the truss or joist structure. A duct support strap and strap hanger support the flexible duct at mid length, and a volume damper is positioned as specified along the return or exhaust air duct.

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