This Alpine SBFD36 36 in. Wide Return Air Support Box with Filter Slot has some cosmetic damage incurred during shipping.  Item has moderate dent in the side. For detailed photos please click 'See Additional Images' above. This Alpine SBFD36 36 in. Wide Return Air Support Box with Filter Slot meets the full manufacturer's specifications, comes with the full manufacturer's warranty, and includes Alpine's premium guarantee.

For product specs and photographs of product in its original condition, click here.

This reversible left or right hand return air support box is for use with systems where the return air must come in underneath the furnace or air handler. The support box can hold a furnace or air handler up to 26 inches wide. The support box features an interior support bracket for maximum strength, and a 20 by 25 inch filter slot that can accommodate a one, four, or five inch thick media filter. The filter rack can be positioned on either the front or the back of the unit. This gives you the flexibility of having your return plenum on either the right or left hand side (simply swap the cover plate and the drawer). This kit does not include a filter.