(518) 746 -0182
Fax: (518) 746-0183

22 Hudson Falls Road, Door 3
South Glens Falls, NY

Return Air Plenum

We Fabricate Return Air Plenums to Your Custom Sizing

Return Air Plenum

Return Air Plenum

Our shop is equipped to fabricate custom return air plenums for all brands of furnace or air handler.

A return air plenum serves the same function as the supply air plenum except the airflow is delivered from the home, collected in the return air plenum chamber, flowing through the furnace filter and back into the furnace cabinet ( see diagram below )

Our return air plenums are fabricated with a 1″ flange so each can be easily sheet metal screwed to the side of your forced air furnace air handler.

Our return air cabinets are made to fit stock sizing of basic home furnace filters. All brands of furnace and air handler have a side cut-out to accommodate return air plenums or cold air boots to fit common filter sizes i.e. 16×25, 16×24 and 16×20

You can contact us or ask your home heating expert to find which return air plenum and filter size will fit your forced air furnace unit along with the size of your home.

All of our return air plenums are fabricated with 26 gauge galvanized sheet metal and a filter rack built inside the plenum cabinet, assembled by hammering together Pittsburgh joints. Every plenum is formed with a 1/2″ or 1″ plenum bend on the bottom end and plenum cap on top, unless no flange is noted by the customer.


Product Details:

  • Fabricated with 26 gaugegalvanized sheet metal
  • Pittsburgh Joints
  • Filter rack
  • 1/2″ or 1″ Plenum Bend
  • Plenum Cap
  • Filter rack cover (optional)
  • Return air box comes fully assembled

Common Sizes:

  • 16″ high x 25″ deep x 24″ wide w/ 16 x 25 Filter Rack
  • 16″ x 20″ x 24″ w/ 16 x 24 Filter Rack
  • 16″ x 20″ x 24″ w/ 16 x 20 Filter Rack
  • 18″, 30″, 36″ wide available

Please visit our contact page to send us any questions on return air plenum sizing and fabrication.


You can purchase sheet metal hand tools used in the fabrication process from our Amazon.com Tool Shop

Full disclosure: we are Amazon.com affiliates