+ Product Details Size - The listed 10" diameter refers specifically to the size of the duct opening
Actual Filter Size – 17 3/4"w x 5 3/4" x 1"
+ Product Details Size - 8"w X 8"h is the size for the duct opening measurement only
Use appropriate fittings and avoid using excessive force when tightening connections
Its flush design ensures durability while the dual directional airflow guarantees balanced distribution
8" X 4" Adjustable AIR Supply Diffuser - HVAC Vent Cover Sidewall or Ceiling - Grille Register - High Airflow - Black w12h12 + Product Details Size -+ Product Details Size 8"w X 4"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 9. 875" width X 6" 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