10" x 10" 2-WAY ALUMINUM BAR CEILING DIFFUSER - Vent Duct Cover - With Opposing Dampers via Lever Control w28h28 + Product Details Size -

+ Product Details Size - 4"w X 18"h is the size for the duct opening measurement only

+ Product Description Maximize HVAC efficiency with our aluminum eggcrate return air filter grille

undisturbed airflow

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

actual front end outer dimensions are approximately 13

10" x 10" 2-WAY ALUMINUM BAR CEILING DIFFUSER - Vent Duct Cover - With Opposing Dampers via Lever Control w28h28 + Product Details Size -+ Product Details Size 10" X 10" 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