8" X 4" Adjustable AIR Supply Diffuser - HVAC Vent Cover Sidewall or Ceiling - Grille Register - High Airflow - Black w30h30 + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 20" x 10" OR 10" x 20" duct opening (measured at the opening)

+ Product Description Improve your HVAC system with our high-quality

+ Product Details Size - 34"w X 18"h is the size for the duct opening measurement only

+ Product Details Size - 12"w X 16"h X 2"d (for duct opening measurement only)

8" X 4" Adjustable AIR Supply Diffuser - HVAC Vent Cover Sidewall or Ceiling - Grille Register - High Airflow - Black w30h30 + Product Details Perfect Fit+ 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