18" X 16" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling w26h26 + Product Details Size –

+ Product Details Size – 30"w X 18"h is the size for the duct opening measurement only

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

actual front end outer dimensions are approximately 18 5/8" width X 28 5/8" height

+ Product Details Size - 14"w X 4"h is the size for the duct opening measurement only

+ Product Details Size - 26"w X 10"h is the size for the duct opening measurement only

18" X 16" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling w26h26 + Product Details Size –+ Product Details Size 18"w X 16"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 875" width X 18" 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