8" x 8" 4-WAY SUPPLY GRILLE - DUCT COVER & DIFFUSER - LOW NOISE - For Ceiling - With Opposing Damper Blades w10h10 this 4-way air vent diffuser

this 4-way air vent diffuser allows you to precisely control airflow

+ Product Details Size - 25"w X 8"h is the size for the duct opening measurement only

[Outer Dimensions: 22

+ Product Details Size – 20"w X 40"h is the size for the duct opening measurement only

8" x 8" 4-WAY SUPPLY GRILLE - DUCT COVER & DIFFUSER - LOW NOISE - For Ceiling - With Opposing Damper Blades w10h10 this 4-way air vent diffuser+ Product Details Size 8" X 8" 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 never