20" X 18" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling 10in diameter + Product Details Size -

+ Product Details Size - 12"w X 12"h X 2"d (for duct opening measurement only)

and smooth surface for years to come

actual front end outer dimensions are approximately 20 5/8" width X 34 5/8" height

+ Product Details Size - 36"w X 8"h is the size for the duct opening measurement only

20" X 18" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling 10in diameter + Product Details Size -+ Product Details Size 20"w X 18"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 875" width X 20" 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