18" X 4" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling flat stamped steel } /* CONTENT SPACING */

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+ Product Details Size - 34"w X 10"h is the size for the duct opening measurement only

Actual Filter Size – 21 3/4"w x 29 3/4" x 1"

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

Actual Filter Size – 23 3/4"w x 9 3/4" x 1"

18" X 4" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling flat stamped steel } /* CONTENT SPACING */+ Product Details Size 18"w X 4"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 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