IMPORTANT SIZING INSTRUCTIONS: Dimensions in listing title will match, and is referring to the hole size for your application. It is NOT the overall dimension of the grille. Also, louvers will run the length of the first dimension length. Shoemaker's 945 Series 3 or 4-Way Adjustable Diffuser features adjustable steel blades, a ceiling or sidewall mount application, and countersunk mounting holes for flush appearance.
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