Balancing damper sleeves are encased in a galvanized sheet metal sleeve, and have an 18 gauge. Each branch should have a balancing damper installed to regulate the amount of air flowing through each branch of your heating and air conditioning system. That way, it's possible to regulate the airflow by adjusting the position of the damper. They should be located in areas that are easily accessible for adjustment. Typical uses are for rooms that get minimal use and can be closed off for extended periods of time or rooms that need different amounts of air flow in the summer and winter. Damper Sleeves are made from Galvanized Steel and have a 1 ½" Stand-Off Damper Handle to raise it above any fiberglass insulation.
Duct Installation Tips & Tricks — To install Damper Sleeves, you simply slide the sleeve into the item you are attaching to and fasted with sheet metal screws and conceal seam with duct tape. We do recommend that you seal around all sheet metal to sheet metal connections with a duct sealant to prevent air leakage, and increase the efficiency of your HVAC system.
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Damper has nylon grommets on each side of the damper which greatly helps with keeping the damper air sealed. The grommets also help with smooth movement of the damper. Damper only has movement of 90 degrees and has a lock nut to prevent the damper from moving once you get your airflow balanced. The damper is not air sealed and is about 1/2 inch smaller in diameter, so even in closed position, it will still allow airflow by (but not much). I will be buying more as I work to replace my 60 year old, undersized duct trunks (I had a ACCA Manual D done and am doing the duct replacements myself as time allows).