20" X 10" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling 10" Diameter + Product Details Size –

+ Product Details Size – 34"w X 30"h is the size for the duct opening measurement only

Actual Filter Size – 33 3/4"w x 35 3/4" x 1"

actual front end outer dimensions are approximately 20 5/8" width X 34 5/8" height

+ Product Spec Sheet Outdoor Louver Spec Sheet

+ Product Details Size – 18"w X 18"h is the size for the duct opening measurement only

20" X 10" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling 10" Diameter + Product Details Size –+ Product Details Size 20"w X 10"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 875" width X 12" 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