MRS HEPA Filtration & Air Scrubbing 3

Question 1

A HEPA filter must capture what minimum percentage of particles at 0.3 microns to meet the HEPA standard?

Accepted Answer

99.97%

Answer

True HEPA filters must capture at least 99.97% of airborne particles at the most penetrating particle size of 0.3 microns.

Question 2

During mold remediation, HEPA-filtered vacuums should be used instead of standard shop vacuums because:

Accepted Answer

Standard vacuums exhaust mold spores back into the air

Answer

Standard shop vacuums lack HEPA filtration and their exhaust air disperses fine mold spores throughout the environment, worsening contamination.

Question 3

When sizing a negative air machine for a containment, the cubic feet per minute (CFM) rating should be calculated based on:

Accepted Answer

The total cubic footage of the containment space and desired ACH

Answer

CFM requirements are determined by multiplying the containment volume (cubic feet) by the desired air changes per hour, then dividing by 60 minutes.

Question 4

Which condition would most likely cause a HEPA air scrubber to lose effectiveness during operation?

Accepted Answer

A clogged or overloaded HEPA filter restricting airflow

Answer

A clogged HEPA filter dramatically reduces airflow (CFM), cutting the number of air changes per hour and allowing contaminants to remain airborne longer.

Question 5

In mold remediation, 'air washing' refers to:

Accepted Answer

Continuously filtering the air in a space to reduce airborne contaminant levels

Answer

Air washing is the process of continuously recirculating and filtering air through HEPA equipment to progressively reduce airborne contaminant concentrations.

(MRS) Mold Remediation Specialist Practice Test

(MRS) Mold Remediation Specialist Practice Test

MRS HEPA Filtration & Air Scrubbing 3