Profile: Plenums Plus offers sheet metal fabrication services. Our services include welding, MIG, TIG, stick, sectioning, cleaning, capping and validation. Our products include ducts & fittings, air distribution and dampers. Our ducts & fittings include round, rectangular, flat oval and spiral pipe. Our air distributions include air grilles, return air grilles, filter grilles, flex duct, aluminum flex and ceiling cans. Dampers include back draft, balancing, smoke and fire.