American Metal 356W12X4 12-inch x 4-inch Steel Wall Diffuser - 1/3-inch Grille B

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VISIT STORE

Varied dispersion for cooling or heating Adjustable multi-louvers damper Three bars to the inch Gasket equipped All steel construction White finish 12" x 4"

American Metal 356W12X4 12-inch x 4-inch Steel Wall Diffuser - 1/3-inch Grille B Review

You can't find better for price under 13.20.