18" X 18" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling 12in diameter Actual Filter Size – 29

Actual Filter Size – 29 3/4"w x 31 3/4" x 1"

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Actual Filter Size – 17 3/4"w x 15 3/4" x 1"

please note that the total outer dimensions of the grille measure 8" in diameter

18" X 18" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling 12in diameter Actual Filter Size – 29+ Product Details Size 18"w X 18"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 875" width X 20" 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