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 950-24X4 Adjustable Diffuser offers a mounting option for both ceiling and sidewall applications, countersunk mounting holes fo a smooth appearance, and enclosed components to assure trouble-free application.
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