Return Air Plenum – 16x20 (Not For Filter) With 14” Round Collar – HVAC, Made In USA

This is a return air plenum for HVAC systems.

It measures 16x20 (and just to be clear, it's not designed to hold a filter—it's a plenum box).

It comes with a 14-inch round collar for duct connection.

It's shop-made in the United States.

Brand is listed as Return Air Filter Rack Plenum.

If you need a simple, solid plenum for your return air setup, this is it.

New, ready to install.