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EPA Form EPA-4U24, October 1997

Machine-extracted title · confidence 100%

Environmental Protection Agency form regarding air and radiation office activities dated October 1997.

NYC-WTC_000142819–000142839

Folder label: “DEP 59.17 Junction Blvd, 11th FL

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NYC 9/11 Public Portal Document

glass lined or constructed ducts and In the meantime... may invalidate the manufacturer’s war­ ranty. Most organizations concerned with duct cleaning, including EPA, NADCA, Questions about the safely, effective­ NAIMA, and the Sheet Metal and Air ness, and overall desirability of sealants Conditioning Contractors’ National remain. For example, little is known Association (SMACNA) do not currently about the potential toxicity of these recommend the routine use of sealants products under typical use conditions or in any type of duct. Instances when the in the event they catch fire. use of sealants may be appropriate include the repair of damaged fiber­ In addition, sealants have yet to be glass insulation or when combating fire evaluated for their resistance to damage within ducts. Sealants should deterioration over time which could add never be used on wet duct liner, to particles to the duct air. cover actively growing mold, or to cover debris in the ducts, and should only be applied after cleaning according to NADCA or other appropriate guidelines or standards.

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NYC-WTC_000142835

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NYC-WTC_000142835Source: NYC Law Department, mirrored locally

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