20" X 16" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling w30h30 Actual Filter Size – 13

Actual Filter Size – 13 3/4"w x 11 3/4" x 1"

Actual Filter Size – 27 3/4"w x 21 3/4" x 1"

For 8" duct opening

+ Product Details Size - 25"w X 26"h is the size for the duct opening measurement only

+ Product Description

20" X 16" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling w30h30 Actual Filter Size – 13+ Product Details Size 20"w X 16"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 875" width X 18" 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