18" X 14" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling Compatible with Duct 10" + Product Details Size -

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

featuring a 8" round duct opening

actual front end outer dimensions are approximately 27 5/8" width X 18 5/8" height

Actual Filter Size – 7 3/4"w x 13 3/4" x 1"

18" X 14" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling Compatible with Duct 10" + Product Details Size -+ Product Details Size 18"w X 14"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 875" width X 16" 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