Spin-in collars reduce the installation time of a duct division line by eliminating the need for screws to hold it in place. Rather, the collars sandwich the duct wall between an internal collar and an outer tapered bead. The correct hole size is required to be sure the spin collar sits securely in the wall of the duct. Once correctly installed, the spin-in collar will provide a fail-safe connection involving a duct back line and the atmosphere register distributing air through your house.
Determine Spin-in Diameter
Measuring the width of the spin-in is the very first step in ensuring it fits correctly from the duct. Taking the dimension from the wrong end of this fitting will permit you to receive a fictitious dimension which will cause an incorrectly hole. Always measure the fitting from the conclusion of the fitting with the taper and subsequently add 1/8 inch to the diameter, allowing room for the fitting to spin at the duct.
Cut and Prepare the Hole
After quantifying the hole, a hole cutter is required to ensure you cut a circular hole at the face of the duct. The hole cutter consists of a pulley that is simulated, a three-sided drill bit and a pivot point. After transferring the pivot point, the smooth finish of the drill bit fits into a drill engine. Rotating the cutter gradually will cut a perfectly round hole in the sheet metal. A 1/2-inch slit is required after cutting, to permit the internal collar to slip through the duct wall.
Safe the Spin-in Collar
Replacing the spin-in collar from the duct demands sliding the border of the internal collar into the cut slit and spinning the fitting clockwise. After one full revolution, the internal collar will pop through the duct and the spin-in collar will sit loosely in the duct. After installation, you put the handle in an accessible location, then pull the internal flange to the bottom of the tapered bead by squeezing them together — in several places — with a pair of self-locking pliers to lock it in place.
Seal the Collar Edges
Even a tight spin-in collar will flow air around its linking point to the ductwork. Apply a water-based sealant to the base of the collar with a paintbrush to prevent air leaks. The sealant requires 24 hours to harden; during this time, you cannot run the air conditioning system.