Building A Plenum With Sheet Metal

Duct board vs metal plenums supply is on perferable over the other.

Building a plenum with sheet metal.

The trim to fit plenum fully assembled measures 20 in. But even with all duct board is it still a building cavity. Simply measure and cut to size using tin snips to match the supply opening of the air handler furnace or evaporator coil. 25 feet should it be ductboard or metal and is hard pipe runs preferable over flex.

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. Sheet metal plenums. As the air blows from the furnace or air handler it flows through the supply plenum and any ductwork attached to it.

The two basic methods of tuning an intake manifold are varying the length of the intake runners and the volume of the plenum. If it s ok with duct board what other materials can make up the walls. 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. Some lite metal work needed to be done to the plenum in order to mate to the notched sections.

Once the full plenum was welded in the plenum was tossed into the jig. Longer runners improve low and mid range torque at the expense of top. 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. The sizes of the supply plenums available here fit the furnaces.

Arizona 24 california 24 nevada 23 type plenum 20 plenum drop 4 gauge 26ga 24 lined yes 8 no 13 flange width 0 5 inches 20 1 5 inches 4 width 13 75 inches 6 16 75 inches 6. I ll give it a name a distributed plenum kind of a 2 dimensional extended plenum.