Bull Nosing
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.
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