HVAC Duct Start Collar Take Off | 8" Sheet Metal Snap Together Start Collar is Compatible with 8" Duct Floor Grille + Product Details Size &

+ Product Details Size & Compatibilty - The 10" to 7" round metal pipe reducer & increaser 30 gauge is compatible with duct 10" to 7"

+ Product Details Size - 36"w X 34"h is the size for the duct opening measurement only

+ Product Details Size & Compatibility – The size of sheet metal pipe is 4" round x 24" long

excluding the old vent cover

HVAC Duct Start Collar Take Off | 8" Sheet Metal Snap Together Start Collar is Compatible with 8" Duct Floor Grille + Product Details Size &+ Product Details Size Sheet metal duct board take off start collar is 8" and it is compatible with duct 8". Premium Quality Our products are made of high quality galvanized sheet metal with crimped ends (snap lock design) for easy fitting and secure connection. Made in the USA. Applications The snap collar duct board fitting is used as a main duct or plenum; a starting collar is installed for attaching a straight or split fitting for the ducts.