6" x 6" - 1-Way Extruded Aluminum Ceiling Diffuser Square - HVAC Vent Cover w36h36 + Product Details Size -

+ Product Details Size - 25"w X 18"h is the size for the duct opening measurement only

Actual Filter Size – 29 3/4"w x 23 3/4" x 1"

Ideal for Walls & Ceilings: Designed for seamless installation in standard 6" X 4" duct openings

Some of the best features aren't readily apparent

6" x 6" - 1-Way Extruded Aluminum Ceiling Diffuser Square - HVAC Vent Cover w36h36 + Product Details Size -+ Product Details Size 6" X 6" 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