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The trunk line is the main duct that runs off the plenum and feeds every branch run to the rooms on its side. This clip looks straight down one, with dust on its floor and a sagging canvas connector at the mouth.
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The camera sits at the mouth of a rectangular supply trunk and looks down its length. Patches of grey dust lie across the metal floor in the foreground, and the side walls inside the trunk carry a dark, even coat.
Around the opening runs a strip of dark canvas, the flexible duct connector. It's the fabric collar between the unit and the sheet metal, there to keep the blower's vibration from traveling into the ductwork. This one has gone slack, and along the top it sags down into the opening.
It was shot on a July job, 41 minutes after another clip from the same job, that one of thick dust packed on a duct elbow.
It's a flexible fabric joint between the furnace or air handler and the sheet metal ductwork. The blower shakes a little when it runs, and the canvas soaks that up so the ducts don't hum or rattle through the house. It should be snug on both edges. Sagging, torn or pulled loose, it leaks air and needs a tech to refasten or replace it.
Want it done at your place? See Air Duct Cleaning at SwiftPro or call (703) 997-9757.
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SwiftPro Heating, Cooling & Plumbing
4230 Lafayette Center Dr N, Chantilly, VA 20151
44679 Endicott Dr, Suite 211, Ashburn, VA 20147
Virginia Class A contractor license #2705192276