Building A Plenum With Sheet Metal

If it s ok with duct board what other materials can make up the walls.

Building a plenum with sheet metal.

As the air blows from the furnace or air handler it flows through the supply plenum and any ductwork attached to it. Once the full plenum was welded in the plenum was tossed into the jig. The two basic methods of tuning an intake manifold are varying the length of the intake runners and the volume of the plenum. The trim to fit plenum fully assembled measures 20 in.

Constructed of 26 gauge sheet metal the knock down design of the plenum takes up very little space and simplifies transporting to the job site. A supply air plenum is a sheet metal box that attaches to the outlet of a furnace or air handler and is used as a central manifold for other ductwork to connect to. Sheet metal plenums. The sizes of the supply plenums available here fit the furnaces.

Duct board vs metal plenums supply is on perferable over the other. But even with all duct board is it still a building cavity. Shop for sheet metal duct pipe fittings at ferguson. A possible construction is all fiberglass duct board with a latitce of metal studs to separate reinforce the top and bottom.

Longer runners improve low and mid range torque at the expense of top. Ferguson is the 1 us plumbing supply company and a top distributor of hvac parts waterworks supplies and mro products. I ll give it a name a distributed plenum kind of a 2 dimensional extended plenum. Adding the velocity stacks straight to the plenum would be ideal for ease of install at this point but the volume of the plenum even with the stacks in it is still too much.

25 feet should it be ductboard or metal and is hard pipe runs preferable over flex. Simply measure and cut to size using tin snips to match the supply opening of the air handler furnace or evaporator coil.