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Law Department notice on WTC document preservation, Oct 2001

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Notice from NYC Law Department instructing staff to preserve World Trade Center documents for potential legal actions.

NYC-WTC_000145027–000145344

Folder label: “NO INFO

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NYC 9/11 Public Portal Document

[B.4] Service openings in Fibrous Glass Ventilation System Components (Duct board): Any Service openings shall be made in such a way as to not significantly weaken the structural integrity of the Fibrous Glass Ventilation System Component or create fiber shed from the product at the cut area once the Access Hole is closed. Upon completion of inspection and/or cleaning services, the Service openings shall be sealed in accordance with job specifications, with one of the following closure techniques:

(1) Install gasketed, insulated Access Doors which will seal the internal cut edge to prevent fibershed, or after an approved ventilation system Bridging Encapsulant has been applied to the cut edge of the internal insulation to prevent fibershed

(2) Make a shiplap or a 45 degree inward "pumpkin" access cut in the ductboard, and reinstall the cut piece after inspection and/or cleaning with a tape that complies with UL 181 or UL 181A closure systems (See NAIMA's Cleaning Fibrous Glass Insulated Air Duct Systems - Recommended Practice, 1993).

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NYC-WTC_000145226

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NYC-WTC_000145226Source: NYC Law Department, mirrored locally

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