18" X 6" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling Fixed Blades with Damper /* increased padding */ border-radius:

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Actual Filter Size – 11 3/4"w x 15 3/4" x 1"

Actual Filter Size – 15 3/4"w x 25 3/4" x 1"

actual front end outer dimensions are approximately 30 5/8" width X 8 5/8" height

18" X 6" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling Fixed Blades with Damper /* increased padding */ border-radius:+ Product Details Size 18"w X 6"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 875" width X 8" 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