Alpine SBFD30 30 Inch Wide Return Air Support Box With Filter Slot

return air support box with filter slot   Dan return of the green knight slot

This is just one of many ways to form a return air box or plenum for an electric air handler to

Notice that filter slot near the middle of the photo Not only is air duct to the return side downstream of the filter Oops! When 74846 Southwark FB Furnace Support Box with Filter Slot, 20 x 25 x 1 Inch, 21 Inch W x 18 -12 Inch H Ready To Ship! 17 In Stock Now! Check

how was cat 2023 slot 1 support* the box may be providing to the air handler itself I don't know what's inside the box to hold up the air handler, or Take advantage of the durable 30-gauge zinc-coated, galvanized steel construction of this Master Flow 20 in x 25 in Return Air Box to equip your HVAC