18" X 6" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling w18h18 + Product Details Size -

+ Product Details Size - 36"w X 4"h is the size for the duct opening measurement only

If your duct opening is 14 inches in diameter

Refrigerant - 1/2" White Insulation - 50' Long

3/8" - 4223 PSI

+ Product Details Size – 32"w X 12"h is the size for the duct opening measurement only

18" X 6" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling w18h18 + Product Details Size -+ Product Details Size 18"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