12" x 12" - Corner Direction Extruded Aluminum Ceiling Diffuser Square - HVAC Vent Cover 6" Diameter 75"H – fits a 20"

75"H – fits a 20" X 18" duct opening

+ Product Details Size – 8"w X 26"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 20 5/8" width X 22 5/8" height

+ Product Details Size – 12"w X 24"h is the size for the duct opening measurement only

12" x 12" - Corner Direction Extruded Aluminum Ceiling Diffuser Square - HVAC Vent Cover 6" Diameter 75"H – fits a 20"+ Product Details Size 12" X 12" is the size for the duct opening measurement only, actual front end outer dimensions are 3". Design Equipped with lever for full airflow control; back blades made of black plastic for reduced air noise and discreet appearance; "Opposing" back blades, ensuring they don't overlap, provide precise damper control and superior air dispersion. High Quality Aluminum The premium durable aluminum will never rust and it will