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actual front end outer dimensions are approximately 18 5/8" width X 27 5/8" height
actual front end outer dimensions are approximately 20 5/8" width X 16 5/8" height
Actual Filter Size – 15 3/4"w x 27 3/4" x 1"
These are specially sized to fit into all drop ceilings
Actual Filter Size – 29 3/4"w x 13 3/4" x 1"
12" X 8" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling Copper Coil actual front end outer dimensions+ Product Details Size 12"w X 8"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 875" width X 10" 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