Super Seal Start Collars from The Duct Shop are fastest and easiest way to start a new round duct run off the side or end of your supply or return plenum. Super Seal Start Collars have a self adhesive gasket to seal the collar to the plenum. As with all of the products from The Duct Shop, Super Seals are manufactured from the highest quality galvanized sheet metal and to our exacting standards.
