Master Flow® Rectangular Stack Duct Starting Collar Specs
Master Flow® Rectangular Stack Duct Starting Collar Docs
Master Flow® Rectangular Stack Duct Starting Collar Videos

Easy Installation
Install with sheet metal screws

Strong
Made of galvanized steel

Versatile
Use to transition from a flat surface to stack duct
Product availability is subject to change without notice. Not all products are available from all facilities.
Get automatic Lifetime Protection on your entire GAF roofing system
When you install any GAF Lifetime Shingle and at least 3 qualifying GAF accessories, you'll automatically get a Lifetime limited warranty on your shingles and all qualifying GAF accessories*.
Where to buy
Find a GAF distributor near you.