Calculate the required air changes per hour for a negative pressure enclosure during asbestos removal under Cal/OSHA:
Correct Answer
B) 4 air changes per hour
Cal/OSHA requires a minimum of 4 air changes per hour for negative pressure enclosures during asbestos removal to ensure proper containment.
Why This Is the Correct Answer
Cal/OSHA Title 8, Section 1529 requires a minimum of 4 air changes per hour for negative pressure enclosures used during asbestos abatement. This rate ensures that airborne asbestos fibers are continuously diluted and captured by the HEPA filtration system, maintaining safe worker conditions and preventing fiber migration outside the enclosure.
Why the Other Options Are Wrong
Option A: 8 air changes per hour
8 air changes per hour exceeds the regulatory minimum and is not the standard required rate. While higher air changes may seem safer, the mandated minimum is 4; using an unsupported figure on the exam will cost you points.
Option C: 2 air changes per hour
2 air changes per hour falls below the Cal/OSHA minimum requirement of 4 and would be inadequate to maintain proper negative pressure and air quality within the asbestos enclosure, creating serious health and compliance risks.
Option D: 6 air changes per hour
6 air changes per hour is not the Cal/OSHA-specified minimum. This is a plausible-sounding distractor, but the regulation specifies exactly 4 air changes per hour as the minimum threshold.
Memory Technique
Think of asbestos removal as a 4-step safety process — and match it to 4 air changes per hour. Or picture a square (4 sides) inside the enclosure representing the four required air changes keeping the air clean.
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