HEPA Filtration & Air Scrubbing Flashcards

Which of the following statements about HEPA filtration efficiency is correct?

Answer: HEPA filter efficiency increases as the filter loads with captured particles

As HEPA filters capture particles and load up, the accumulated debris forms additional filtration layers that actually improve efficiency, though airflow resistance also increases.

In a large commercial mold remediation project, multiple negative air machines are used primarily to:

Answer: Achieve the required air changes per hour in large or complex spaces

Multiple units are used when a single machine cannot provide adequate CFM to achieve the required air changes per hour in large or compartmentalized spaces.

An air scrubber placed at the 'dirty end' of a containment with exhaust at the 'clean end' creates:

Answer: A directional airflow pattern pushing contaminated air away from the clean zone

Positioning the intake at the dirty end and exhaust at the clean end creates a directional sweep that moves contaminated air away from clean areas and workers entering the space.

Which statement about HEPA filter disposal after mold remediation is CORRECT?

Answer: Used HEPA filters must be sealed in plastic bags before disposal as contaminated waste

Used HEPA filters must be carefully removed inside the containment, double-bagged in sealed plastic bags, and disposed of as contaminated remediation waste.

The term 'CFM' as it relates to air scrubbers stands for:

Answer: Cubic Feet per Minute

CFM (Cubic Feet per Minute) is the volumetric airflow rate used to rate air scrubber output and calculate how many air changes per hour a unit can achieve in a given space.

During remediation in an occupied building, negative pressure containment serves which CRITICAL secondary function beyond preventing spore spread?

Answer: Protecting building occupants from chemical cleaning agent vapors

Negative pressure containment also prevents chemical vapors from antifungal biocides and cleaning agents from migrating into occupied areas of the building.

What is the recommended action if a negative air machine shuts down unexpectedly mid-project in a critical containment?

Answer: Stop all work, reseal any disturbed areas, and restore negative pressure before resuming

When negative pressure is lost, work must stop immediately to prevent spore migration; containment integrity must be verified and negative pressure fully restored before any remediation activity resumes.