30" X 12" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling Grille Actual Filter Size – 21

Actual Filter Size – 21 3/4"w x 25 3/4" x 1"

+ Product Details Size – 10"w X 10"h is the size for the duct opening measurement only

Actual Filter Size – 7 3/4"w x 33 3/4" x 1"

this model allows for mounting without removing the thermostat

30" X 12" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling Grille Actual Filter Size – 21+ Product Details Size 30"w X 12"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 31. 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