8" X 4" Adjustable AIR Supply Diffuser - HVAC Vent Cover Sidewall or Ceiling - Grille Register - High Airflow - Black Fixed Blades + Product Details Size -

+ Product Details Size - 6"w X 10"h is the size for the duct opening measurement only

75"H – fits a 18" X 18" duct opening

it ensures long-lasting performance

Operating from -40°F to +248°F

+ Product Details Size - 14"w X 6"h is the size for the duct opening measurement only

8" X 4" Adjustable AIR Supply Diffuser - HVAC Vent Cover Sidewall or Ceiling - Grille Register - High Airflow - Black Fixed Blades + 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