18" X 4" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling Compatible With Duct 10in + Product Details Size -

+ Product Details Size - 20"w X 4"h is the size for the duct opening measurement only

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Actual Filter Size – 24 3/4"w x 15 3/4" x 1"

High Quality – High quality ABS plastic will never rust

The total outer size of this grille is the listed size plus plus 2 and 5/8"

18" X 4" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling Compatible With Duct 10in + Product Details Size -+ 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