What is the proper construction for a curtained doorway in an asbestos handling area?

The proper construction for a curtained doorway in an asbestos handling area is designed to minimize the escape of asbestos fibers while allowing personnel to move in and out of the regulated space. Using three overlapping sheets of poly with alternating entrances is effective because it creates a barrier that significantly reduces the possibility of airborne asbestos fibers escaping the work area. The alternating entrances ensure that when one is used, the other sheets remain in place, providing a consistent level of containment.

This construction method is critical for maintaining air quality and protecting both workers and the surrounding environment from potential contamination. The overlap of the sheets also helps trap any fibers that may be present, as they are prevented from easily passing through the openings. In addition, having three sheets provides redundancy; even if one section is disturbed, the other two continue to function as a barrier.

In contrast, using one sheet of heavy-duty plastic would not provide adequate containment, as it allows for a direct path for fibers to escape when the sheet is opened. Similarly, while four overlapping sheets might seem more secure, having no entrances would render the doorway useless for people needing to enter or exit the area, negating the practical function of a curtain doorway.