20" X 6" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling w34h34 + Product Details Size –

+ Product Details Size – 14"w X 30"h is the size for the duct opening measurement only

+ Product Details Size - 4"w X 16"h is the size for the duct opening measurement only

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Think of the diameter as a straight line from one end to the other

actual front end outer dimensions are approximately 36 5/8" width X 20 5/8" height

20" X 6" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling w34h34 + Product Details Size –+ Product Details Size 20"w X 6"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 875" width X 8" 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