18" X 10" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling w8h8 + Product Details Size –

+ Product Details Size – 18"w X 8"h is the size for the duct opening measurement only

2" X 10" Is The Size For The Duct Opening (floor/vent hole) Measurement Only

+ Product Details Size – 20"w X 34"h is the size for the duct opening measurement only

Actual Filter Size – 19 3/4"w x 33 3/4" x 1"

18" X 10" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling w8h8 + Product Details Size –+ Product Details Size 18"w X 10"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 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