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A nylon draw band and tensioning tool are used to secure the inner coil of the pre-insulated flexible duct
A nylon draw band and tensioning tool are used to secure the inner liner of the pre-insulated flexible duct
After securing the inner coil, cover the draw band and the seam with a generous amount of mastic
Assembled section of fiber board duct
Collars that are specifically made for flexible duct have a raised bead to prevent the duct from slipping off
Cut fiber board with a red V-groove tool and a gray shiplap tool to create mitered corners and a shiplapped edge for duct sections
Fiber board sheets are available with pre-cut shiplapped ends
Fiberglass duct board typically comes in sheets 4 foot wide by 10 foot long
Hand tools for cutting fiber board sheets include a knife, straight edge, and color-coded edge-cutting tools
Pull the insulation and outer liner of the flex duct over the collar to come in full contact with the liner and insulation of the trunk line or fitting and tape in place
Seal all joints and seams in the metal ductwork with mastic before installing insulation
Seal seams in fiber board ducts with out-clinching staples, UL-181A-approved tape, and mastic
The tape is covered with mastic to ensure an airtight seal between the duct and the fitting
To attach the flex duct to a main trunk duct or any other connection, the flex duct is pulled over the connecting collar at least 2 inches past the raised bead, then the insulation is pulled back
Two pieces of flex duct are spliced together with a metal sleeve, nylon draw bands, mastic, metal tape, and more mastic
Use only Underwriters Laboratory UL-181 approved tape
When wrapping metal pipes with insulation allow two inches of overlap and staple along the seam with outward clinching staples