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

+ 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

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

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