Small Walk-In Enclosure

A small walk-in enclosure which accommodates no more than two persons (mini-enclosure) may be used if the disturbance or removal can be completely contained by the enclosure with the following specifications and work practices:

• The fabricated or job-made enclosure must be constructed of 6 mil plastic or equivalent.
• The enclosure must be placed under negative pressure by means of a HEPA filtered vacuum or similar ventilation unit.
• Before use, the mini-enclosure must be inspected for leaks and smoke-tested to detect breaches, and breaches sealed.
• Before reuse, the interior must be completely washed with amended water and HEPA-vacuumed.
• During use, air movement must be directed away from the employee's breathing zone within the mini-enclosure.

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