10" X 4" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling Round Damper Ring accordion-content')

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+ Product Details Size – 25"w X 30"h is the size for the duct opening measurement only

+ Product Details Size – 30"w X 16"h is the size for the duct opening measurement only

these heavy-duty louvers are ideal for use in attics

+ Product Details Size – 8"w X 28"h is the size for the duct opening measurement only

10" X 4" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling Round Damper Ring accordion-content')+ Product Details Size 10"w X 4"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 11. 875" width X 6" height. High Quality High quality steel construction, no scuff powder coat durable finish, smooth, shiny, scratch resistant, no sharp edges, 2 recessed screw holes on each side with screws included, screws same color as vent cover, easy installation. Adjustable airflow control Adjustable airflow