6" x 6" - 1-Way Extruded Aluminum Ceiling Diffuser Square - HVAC Vent Cover 12in diameter + Product Details Size -

+ Product Details Size - 28"w X 14"h is the size for the duct opening measurement only

Ideal for Walls & Ceilings: Designed for seamless installation in standard 18" X 18" duct openings

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+ Product Details Size - 10"w X 16"h is the size for the duct opening measurement only

By means of the smooth surface

6" x 6" - 1-Way Extruded Aluminum Ceiling Diffuser Square - HVAC Vent Cover 12in diameter + 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