+ Product Details Size – 30"w X 20"h is the size for the duct opening measurement only
+ Product Details Size – 36"w X 10"h is the size for the duct opening measurement only
at predicted low air motion 35 fpm in the zone of occupancy
For 12" Round Duct Opening - Spiral or Flex
Actual Filter Size – 33 3/4"w x 35 3/4" x 1"
20" X 12" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling white + Product Details Size –+ Product Details Size 20"w X 12"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 21. 75" width X 13. 75" 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