Return Air Drops, Plenums and Boxes

Southwark FB Furnace Support Box, 16 x 25 x 1 Inch, 17-1/2 Inch W x 18 Inch H

Southwark FB Furnace Support Box with Filter Slot, 20 x 25 x 1 Inch, 21 Inch W x 18 -1/2 Inch H

Southwark FSB1L-1428-12H Furnace Support Box, 14-1/2 Inch W x 28 Inch D x 12 Inch H

Southwark FSB1L-1428-6H Furnace Support Box, 14-1/2 Inch W x 28 Inch D x 6 Inch H

Southwark FSB1L-17-1/2X28-6H Furnace Support Box, 17-1/2 Inch W x 28 Inch D x 6 Inch H

Southwark FSB1L-2128-6H Furnace Support Box, 21 Inch W x 28 Inch D x 6 Inch H

Southwark FSB1L-24-1/2X28-6H Furnace Support Box, 24-1/2 Inch W x 28 Inch D x 6 Inch H

Southwark SB Return Air Support Box, 10 x 25 Inch, Sheet Metal, 28 Inch W x 10 Inch H x 38 Inch D

Southwark SBF Return Air Support Box with Filter Access Tray, 10 x 25 Inch, Sheet Metal, 26 Inch W x 36 Inch D