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The operable dampers
actual front end outer dimensions are approximately 32 5/8" width X 22 5/8" height
+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 20" or 20" x 12" duct opening (measured at the opening)
+ Product Details Size – 36"w X 30"h is the size for the duct opening measurement only
Actual Filter Size – 23 3/4"w x 13 3/4" x 1"
20" X 4" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling Color_Anodized Aluminum The operable dampers+ Product Details Size 20"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