Building A Plenum With Sheet Metal

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.

Building a plenum with sheet metal. 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. If it s ok with duct board what other materials can make up the walls. Sheet metal plenums. If i am going to have a supply plenum run for approx.

Shop for sheet metal duct pipe fittings at ferguson. 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 two basic methods of tuning an intake manifold are varying the length of the intake runners and the volume of the plenum. 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. I ll give it a name a distributed plenum kind of a 2 dimensional extended plenum. The trim to fit plenum fully assembled measures 20 in. 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.

Some lite metal work needed to be done to the plenum in order to mate to the notched sections. But even with all duct board is it still a building cavity. 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.

As the air blows from the furnace or air handler it flows through the supply plenum and any ductwork attached to it. A possible construction is all fiberglass duct board with a latitce of metal studs to separate reinforce the top and bottom.