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Asbestos Abatement Guidelines and Policies <br />Page 01513-1 <br />SECTION 01513 <br /> <br />NEGATIVE PRESSURE SYSTEM <br /> <br /> <br />1.01 GENERAL <br /> <br />A. A negative pressure system shall be used. The negative pressure system requirements <br />are as follows. <br /> <br />B. High efficiency particulate air (HEPA) filter exhaust systems equipped with new HEPA <br />filters for each project shall be used. Exhaust equipment and systems shall comply with <br />ANSI Z9.2-79 and used according to manufacturer's recommendations. <br /> <br />C. A system of HEPA-equipped air filtration devices shall be configured so that a pressure <br />differential is established between the work area and the surrounding area (-0.02 to - <br />0.04" water column). A continuous chart-recorded manometer shall be used to confirm <br />this condition. <br /> <br />D. Additional air filtration devices shall be provided inside the work area for emergency <br />standby as well as for circulation of dead air spaces. <br /> <br />E. The pressure differential is maintained at all times after preparation is complete and <br />until the final visual inspection and air tests confirm the area is clean and acceptable for <br />occupancy and the designer confirms verbally with written follow-up to discontinue the <br />use of the negative pressure system. <br /> <br />F. Air shall be exhausted outside the buildings. Any variations must be approved by the <br />HHCU. <br /> <br />G. The contractor shall check daily for leaks and log his checks in the bound logbook. This <br />includes checks internal to air-moving devices. <br /> <br />H. There shall be a minimum of four air changes per hour in any containment. <br /> <br /> <br />DocuSign Envelope ID: 09980A3B-0691-41B4-854D-3865F2287392