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In addition, Class I asbestos work shall be performed using one or more of the following control methods pursuant to the limitations stated below:
1926.1101(g)(5)(i) Negative Pressure Enclosure (NPE) Systems:
NPE systems may be used where the configuration of the work area does not make the erection of the enclosure infeasible, with the following specifications and work practices.
1926.1101(g)(5)(i)(A) Specifications:
The negative pressure enclosure (NPE) may be of any configuration,
At least 4 air changes per hour shall be maintained in the NPE,
A minimum of —0.02 column inches of water pressure differential, relative to outside pressure, shall be maintained within the NPE as evidenced by manometric measurements,
The NPE shall be kept under negative pressure throughout the period of its use, and
Air movement shall be directed away from employees performing asbestos work within the enclosure, and toward a HEPA filtration or a collection device.
1926.1101(g)(5)(i)(B) Work Practices:
Before beginning work within the enclosure and at the beginning of each shift, the NPE shall be inspected for breaches and smoke-tested for leaks, and any leaks sealed.
Electrical circuits in the enclosure shall be deactivated, unless equipped with ground-fault circuit interrupters.
Glove bag systems may be used to remove PACM and/or ACM from straight runs of piping and elbows and other connections with the following specifications and work practices:
1926.1101(g)(5)(ii)(A) Specifications:
Glovebags shall be made of 6 mil thick plastic and shall be seamless at the bottom.
Glovebags used on elbows and other connections must be designed for that purpose and used without modifications.
1926.1101(g)(5)(ii)(B) Work Practices:
Each glovebag shall be installed so that it completely covers the circumference of pipe or other structure where the work is to be done.
Glovebags shall be smoke-tested for leaks and any leaks sealed prior to use.
Glovebags may be used only once and may not be moved.
Glovebags shall not be used on surfaces whose temperature exceeds 150 °F.
Prior to disposal, glovebags shall be collapsed by removing air within them using a HEPA vacuum.
Before beginning the operation, loose and friable material adjacent to the glovebag/box operation shall be wrapped and sealed in two layers of six mil plastic or otherwise rendered intact,
Where system uses attached waste bag, such bag shall be connected to collection bag using hose or other material which shall withstand pressure of ACM waste and water without losing its integrity:
Sliding valve or other device shall separate waste bag from hose to ensure no exposure when waste bag is disconnected:
At least two persons shall perform Class I glovebag removal operations.

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