30" X 4" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling Round Damper Ring Actual Filter Size – 33

Actual Filter Size – 33 3/4"w x 17 3/4" x 1"

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Actual Filter Size – 31 3/4"w x 23 3/4" x 1"

Actual Filter Size – 31 3/4"w x 11 3/4" x 1"

+ Product Details Size - 30"w X 12"h X 2"d (for duct opening measurement only)

30" X 4" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling Round Damper Ring Actual Filter Size – 33+ Product Details Size 30"w X 4"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 31. 875" width X 6" 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