MRS Personal Protective Equipment 3 — Questions and Answers
Question 1: What is the purpose of a negative-pressure fit check on a half-face respirator before entering a mold-contaminated area?
- To verify that the exhalation valve is blocked
- To confirm the facepiece creates an airtight seal against the face (Correct answer)
- To test the filter's particle-capture efficiency
- To check that the head straps are not damaged
Correct answer: To confirm the facepiece creates an airtight seal against the face
A negative-pressure fit check confirms that the respirator facepiece seals tightly against the face by blocking the inlets and inhaling; any air leakage indicates a poor seal.
Question 2: Under OSHA's Respiratory Protection Standard (29 CFR 1910.134), how often must workers who use tight-fitting respirators receive a qualitative or quantitative fit test?
- Every 6 months
- Annually (Correct answer)
- Every 2 years
- Only at initial hire
Correct answer: Annually
OSHA requires fit testing at least annually, as well as whenever the worker's physical condition changes in a way that could affect the facepiece seal.
Question 3: Which condition requires a worker to be immediately removed from a mold remediation area regarding PPE?
- The worker's coverall zipper partially opens
- The worker's respirator strap loosens during work
- The worker experiences shortness of breath or dizziness while wearing a respirator (Correct answer)
- The worker's gloves have minor surface discoloration
Correct answer: The worker experiences shortness of breath or dizziness while wearing a respirator
Shortness of breath or dizziness may indicate respirator malfunction, inadequate oxygen, or a medical issue — the worker must exit immediately for safety evaluation.
Question 4: A remediation worker must enter an area with unknown mold concentrations. What is the safest initial PPE selection approach?
- Start with minimum PPE and upgrade if needed
- Use the highest available protection level until assessment is complete (Correct answer)
- Use an N95 respirator and standard work clothes
- No PPE is needed until air sampling results are received
Correct answer: Use the highest available protection level until assessment is complete
When mold concentration is unknown, workers should use the highest available protection level and downgrade only after a qualified professional assesses actual conditions.
Question 5: What is the risk of reusing disposable N95 respirators across multiple mold remediation shifts?
- No risk — N95s can be reused indefinitely if not visibly damaged
- Mold spores can accumulate and grow on the filter media, increasing exposure risk (Correct answer)
- The respirator's color may change, misleading inspectors
- The headband may stretch but filtration efficiency remains constant
Correct answer: Mold spores can accumulate and grow on the filter media, increasing exposure risk
Mold spores trapped on filter media can proliferate, and extended reuse degrades the filter and seal integrity, increasing the worker's risk of inhalation exposure.
Question 6: When is it appropriate to use a powered air-purifying respirator (PAPR) instead of a standard N95 during mold remediation?
- Only when the worker prefers it for comfort
- When the worker has facial hair, cannot achieve a seal, or when higher airflow is needed (Correct answer)
- Only in outdoor remediation settings
- When N95 masks are temporarily out of stock
Correct answer: When the worker has facial hair, cannot achieve a seal, or when higher airflow is needed
PAPRs are appropriate when a tight-fitting respirator cannot achieve a proper seal (e.g., due to facial hair) or when higher airflow and comfort are required for prolonged tasks.
Question 7: Which footwear requirement applies to mold remediation workers operating inside a containment zone?
- Standard athletic shoes are acceptable
- Steel-toed boots with no additional covering needed
- Rubber boots or shoe covers that prevent tracking spores outside the containment (Correct answer)
- No specific footwear requirement exists for mold work
Correct answer: Rubber boots or shoe covers that prevent tracking spores outside the containment
Workers must wear rubber boots or disposable shoe covers to prevent mold spores from being tracked out of the containment zone on footwear.
MRS Personal Protective Equipment 3
What is the purpose of a negative-pressure fit check on a half-face respirator before entering a mold-contaminated area?