24" X 24" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling Compatible With Duct 12in + Product Details Size -

+ Product Details Size - 18"w X 12"h is the size for the duct opening measurement only

Actual Filter Size – 11 3/4"w x 31 3/4" x 1"

Marked circles for cutout

Design – Cubic core eggcrate design Offers highest airflow efficiency at almost 95%

Actual Filter Size – 33 3/4"w x 35 3/4" x 1"

24" X 24" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling Compatible With Duct 12in + Product Details Size -+ Product Details Size 24"w X 24"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 25. 875" width X 26" 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