CMI Personal Protective Equipment for Mold Work 1 — Questions and Answers
Question 1: According to the EPA and IICRC S520, what minimum respiratory protection is required when performing mold remediation in a Limited Remediation area (10–100 sq ft of mold)?
- No respiratory protection is required for areas under 100 sq ft
- N95 half-face respirator at minimum (Correct answer)
- Full-face air-purifying respirator with HEPA cartridges
- Supplied-air respirator (SCBA) only
Correct answer: N95 half-face respirator at minimum
IICRC S520 mandates a minimum N95 half-face respirator for limited remediation areas to protect against mold spore inhalation. No protection is inadequate for known mold exposure at this scale. Full-face APR with HEPA cartridges and supplied-air respirators are reserved for extensive remediation areas or high-toxicity scenarios exceeding 100 square feet.
Question 2: An N95 respirator provides protection against mold spores by filtering out at least what percentage of airborne particles 0.3 microns and larger?
- 50%
- 75%
- 95% (Correct answer)
- 99.97%
Correct answer: 95%
The '95' in N95 means the respirator filters at least 95% of airborne particles 0.3 microns and larger under standardized NIOSH testing conditions. Higher-rated classes include N99 (99%) and N100/P100 (99.97%). Mold spores range from 2–100 microns, making N95 effective; however, smaller mycotoxin-bearing particles also benefit from this level of filtration.
Question 3: Which level of protective suit is recommended during mold remediation work in a heavily contaminated area (>100 sq ft per IICRC S520 large remediation)?
- Standard work clothing with gloves only
- Disposable coveralls (Tyvek or equivalent) with hood and booties (Correct answer)
- Level A fully encapsulating chemical protective suit
- Level B suit with supplied-air respirator
Correct answer: Disposable coveralls (Tyvek or equivalent) with hood and booties
Disposable Tyvek coveralls with hood and booties provide an adequate barrier against mold spore contact and prevent carrying contamination into clean areas. Level A fully encapsulating suits are designed for acute chemical or CBRN hazards and are impractical for mold remediation. Standard work clothing leaves skin and clothing exposed to spore deposition and cross-contamination.
Question 4: Eye protection is required during mold sampling and remediation primarily to prevent:
- UV radiation damage from inspection lighting
- Contact of mold spores or airborne particles with mucous membranes of the eyes (Correct answer)
- Chemical splash from disinfectants used as personal hygiene only
- Physical debris from power tools used during demolition
Correct answer: Contact of mold spores or airborne particles with mucous membranes of the eyes
The eyes contain mucous membranes that can absorb mold spores, allergens, and mycotoxins, leading to irritation, sensitization, or infection. Eye protection creates a physical barrier against airborne particles generated during remediation and sampling. Standard inspection lights do not emit harmful UV, and while chemical splash protection is relevant when using disinfectants, it is a secondary rather than the primary reason for eye PPE in mold work.
Question 5: When removing disposable PPE after leaving a mold remediation containment area, what is the correct order to minimize self-contamination?
- Remove gloves first, then respirator, then coveralls, then goggles
- Remove outer gloves last; remove coveralls and booties while still wearing respirator and goggles, then remove face protection outside the contaminated area (Correct answer)
- Remove respirator first to allow clear vision during suit removal
- No specific order is required for disposable PPE
Correct answer: Remove outer gloves last; remove coveralls and booties while still wearing respirator and goggles, then remove face protection outside the contaminated area
Removing coveralls and booties while the respirator and goggles are still in place prevents inhaling or contacting spores dislodged during the doffing process. Removing the respirator first is the most dangerous sequence because disturbing contaminated coveralls releases spores directly in front of unprotected airways. Outer gloves are removed last to keep hands clean throughout the entire removal process.
Question 6: Nitrile gloves are preferred over latex gloves for mold work primarily because:
- Nitrile provides greater dexterity for sampling equipment
- Nitrile avoids latex allergy risks and provides superior chemical resistance to many disinfectants (Correct answer)
- Latex is more expensive and harder to source
- Nitrile is required by OSHA regulation 29 CFR 1910.138
Correct answer: Nitrile avoids latex allergy risks and provides superior chemical resistance to many disinfectants
Nitrile is preferred because it eliminates the risk of potentially severe latex hypersensitivity reactions and provides superior resistance to the disinfectants and biocides commonly used during mold remediation. While there is no specific OSHA regulation mandating nitrile over latex for mold work, the combination of allergy prevention and chemical compatibility makes it the professional standard.
CMI Personal Protective Equipment for Mold Work 1
According to the EPA and IICRC S520, what minimum respiratory protection is required when performing mold remediation in a Limited Remediation area (10–100 sq ft of mold)?