actual front end outer dimensions are approximately 26 5/8" width X 8 5/8" height -
no professional tools needed
+ Product Details Size - 30"w X 26"h is the size for the duct opening measurement only
Actual Filter Size – 31 3/4"w x 23 3/4" x 1"
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10" X 10" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling steel actual front end outer dimensions+ Product Details Size 10"w X 10"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 11. 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