20" X 18" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling Compatible With Duct 6in Actual Filter Size – 33

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

Installing the plaster frame is effortless – secure it into your sheetrock

+ Product Details Size - 26"w X 24"h is the size for the duct opening measurement only

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20" X 18" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling Compatible With Duct 6in Actual Filter Size – 33+ Product Details Size 20"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