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plenum

  1. J

    Class 3B combustible liquid in plastic pipe/tubing in plenum

    Lots to unpack in the title. For reference, class 3B liquids (NFPA 30) are fairly high flashpoint liquids > 200 degrees F but range from diesel fuel to cooking oil. I have a good grasp on the plastic in plenum discussion, but am wondering about the introduction of a "combustible" liquid into...
  2. E

    Space above ceiling used as non ducted plenum returns

    I am working on a 1200 sq ft addition to a commercial (bank) building with masonry walls with wooden roof trusses. There is no sprinkler system in the building. Nothing will be stored above the dropped ceiling. The insulation is on the roof, so there will be no insulation in the space above the...
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