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...BiggerYellow.png|thumb|350px|A plenum created by accident can go unnoticed and become a fire hazard, due to cabling being installed under the assumption t ...powered equipment is allowed in the plenum space because presence of fresh air can greatly increase danger of rapid flame spreading should the equipment c

...II Elemental classification for Building Specifications, Cost Estimating, and Cost Analysis," NIST BFRL Office of applied Economics, NISTIR6389, October ...el and Dru Meadows, Green Building Materials: A Guide to Product Selection and Specification, John Wiley & Sons, Inc., New York, 1999.</ref>.

...mold hazard in a structure, and mold remediation is the process of removal and/or cleanup of mold from an indoor environment. ...they are a health hazard to humans, potentially causing allergic reactions and respiratory problems.