Mechanical · M-QF9JT

HVAC Duct Branch Take-off Connections and Fittings

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The assembly connects rectangular and round branch ducts to a main supply, return, or exhaust duct for low or medium pressure HVAC systems. Branch connections utilize 45 degree entry fittings, conical duct take-off fittings, or bellmouth duct take-off fittings, with spin-in fittings permitted only where main duct dimensions are insufficient. Volume dampers are installed within the branch ducts as indicated on plans for airflow control. All duct fittings are sealed airtight per specification and fabricated in accordance with the latest edition of the SMACNA duct construction manual.

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