Deflect unwanted drafts from wall mounted HVAC vents, grills and diffusers. Choose a custom length from 8" thru 22-1/4" long. Longer sizes available, click this link. Choose a length in 1/4" increments. We will include self-tapping metal screws with your purchase. Made of modified high impact frosted acrylic. Approx. 6.9" high. Pre-drill into the "T" flange before installing with self tapping screws. Custom cut wall air diverters are not returnable.