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Bull Nosing

Harry Thompson IVFebruary 27th, 2019

Double Wall Rectangular Duct and Covering the Raw Edge of Duct Liner on the four sides: Press-On Bull Nosing Angle as a labor savings vs Making Angle in House

SMACNA calls for Bullnosing over the exposed Duct Liner Edge that’s facing the airstream, near a fan or in high velocity systems.

A shop that makes a lot of double wall rectangular duct is a good candidate for Ductmate’s new peel and stick bull nosing because they bend four angles and screw them on inside Solid wall to cover the Raw edge of the liner running transversely on all four sides.

Ductmate is offering lengths of Self-Adhesive Bull Nosing in 1”, 1-1/2” and 2” for the three thicknesses of Duct Liner.

The “corner intersection” of the bullnose is not an issue with respect to delamination of the insulation unless the velocity of the air is in excess of 3,000 fpm.

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Long section extending over the raw edge of liner and sticking on the edge of the duct.