Return Air Drops, Plenums and Boxes

Southwark FB Furnace Support Box, 14 x 25 x 18 Inch, 14-1/2 Inch W x 18 Inch H

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

Southwark 1076 Adjustable Plenum, Sheet Metal, 24 Inch W x 36 Inch H x 24 Inch D

Southwark 1076 Adjustable Plenum, Sheet Metal, 24 Inch W x 48 Inch H x 24 Inch D

Southwark FB Furnace Support Box, 16 x 25 x 1 Inch, 17-1/2 Inch W x 18 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 1074 Style A Plenum with Top, Sheet Metal, 20 Inch W x 48 Inch H x 16-1/2 Inch D

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