Div. B › Part 6 › 6.2 › 6.2.3 — Air Duct Systems

6.2.3.5 — Underground Ducts

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(1) Underground ducts shall,
(a) be constructed and installed with a slope to provide interior drainage to all low points,
(b) not be connected directly to a sewer, and
(c) be installed and constructed of materials in conformance with ASHRAE Handbooks, SMACNA Manuals and the HRAI Digest.
(2) A clean-out or pump-out connection shall be provided in an underground duct system at every low point of the duct system.
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