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actual front end outer dimensions are approximately 20 5/8" width X 22 5/8" height
+ Product Details Size – 24"w X 30"h is the size for the duct opening measurement only
actual front end outer dimensions are 19" Width X 13" Height
you can attain the diameter of the vent
24" X 20" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling Aluminum Bar Click Add to Cart now+ Product Details Size 24"w X 20"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 25. 875" width X 22" 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