10" X 10" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling 18" Round Duct Pipe actual front end outer dimensions

actual front end outer dimensions are approximately 18 5/8" width X 38 5/8" height

+ Product Details Size – 18"w X 20"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 36 5/8" width X 30 5/8" height

These are airflow control components made to connect to supply grilles of the drop ceiling

10" X 10" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling 18" Round Duct Pipe actual front end outer dimensions+ Product Details Size 10"w X 10"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 11. 875" width X 12" 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