Geeeze... I guess I gotta hang out here all the time. LOLOL
To answer your question, Yes!
Plenum is just a HVAC tern for an air box. Mine is made of 3/4" plywood, no lining, and mounted in the space above the ceiling about 5 to 6 ft from the torch flame. The transition gave me room to mount a set of louvers and a 'critter' screen; I have some inquisitive squirrels.
You can see the transition from the box to the side of the building in the photo. I added the hood pic to show that the plenum sits just above the hood in the studio below. There is no insulation or lining in the plenum and with my Mirage/Kabuki torch running with all fires it doesn't heat up enough to feel any differance.
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