CMI Personal Protective Equipment for Mold Work

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)?

Accepted Answer

N95 half-face respirator at minimum

Answer

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?

Accepted Answer

95%

Answer

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)?

Accepted Answer

Disposable coveralls (Tyvek or equivalent) with hood and booties

Answer

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:

Accepted Answer

Contact of mold spores or airborne particles with mucous membranes of the eyes

Answer

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?

Accepted Answer

Remove outer gloves last; remove coveralls and booties while still wearing respirator and goggles, then remove face protection outside the contaminated area

Answer

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.

(CMI) Certified Mold Inspector Practice Test

(CMI) Certified Mold Inspector Practice Test

CMI Personal Protective Equipment for Mold Work