12" X 12" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling w12h12 which the interior PET provides

which the interior PET provides

+ Product Details Size - 20"w X 32"h is the size for the duct opening measurement only

+ Product Details Size - 30"w X 25"h is the size for the duct opening measurement only

Actual Filter Size – 35 3/4"w x 27 3/4" x 1"

these heavy-duty louvers are ideal for use in attics

12" X 12" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling w12h12 which the interior PET provides+ Product Details Size 12"w X 12"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 875" width X 14" 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