Return Air Boxes by Sherer Manufacturing

These boxes are helpful in the fact that you do not have to fabricate one of them yourself by using Ductboard. These boxes are ready for a return air grill. All you have to do is supply the starting metal tab collar in the back.

•Black antimicrobial fiberglass liner •Oversize by 1/2" to accommodate filter grills •4 1/2" high plus 1/2" lip •Many standard sizes plus custom