12" BUTTERFLY DAMPER - For T-Bar, Drop Ceiling Grilles, (12" round duct opening) Sheet Metal/Adjustable Elbow and conventional HVAC air conditioning

and conventional HVAC air conditioning system line sets

complies with ASTM E 84

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Ideal for Walls & Ceilings: Designed for seamless installation in standard 18" X 6" duct openings

you can watch this informative video tutorial: How to Measure Your Vent Hole Before Ordering a Grille

12" BUTTERFLY DAMPER - For T-Bar, Drop Ceiling Grilles, (12" round duct opening) Sheet Metal/Adjustable Elbow and conventional HVAC air conditioning+ Product Details Size 12" round duct opening Heavy Gauge Steel Heavier gauge than needed, built for durability and long life in mind, but still very thin. Installation Location Ceiling. Design This airflow control component are made to connect to a drop ceiling lay in diffuser grille. Powder Coat Finish smooth, shiny, scratch resistant, beautiful. Looks like it was just waxed. + Product Description Introducing the 6" Butterfly Damper Your Solution