CMI CMI HVAC Systems & Ventilation Inspection 3

Question 1

Which method is used by mold inspectors to evaluate HVAC duct contamination without full duct disassembly?

Accepted Answer

Swab or bulk sampling from accessible duct openings and visual inspection with a borescope camera

Answer

Combination of swab or bulk sampling at accessible points and borescope camera inspection allows the inspector to assess interior duct contamination without destructive disassembly.

Question 2

A mold inspector finds mold growth on the interior insulation of a return air plenum. What remediation approach is typically required?

Accepted Answer

Remove and replace the contaminated insulation, as fibrous materials cannot be adequately cleaned

Answer

Porous fibrous insulation cannot be adequately decontaminated once colonized by mold; removal and replacement is the industry-standard approach per IICRC S520.

Question 3

What does a high duct leakage rate indicate about building mold risk from an HVAC perspective?

Accepted Answer

Leaky ducts can draw in humid unconditioned air and deposit it throughout the system, increasing moisture and mold risk

Answer

Leaky return ducts especially can pull in warm moist air from unconditioned spaces like crawl spaces or attics, distributing moisture throughout the HVAC system and into conditioned spaces.

Question 4

According to NADCA standards, what is the primary trigger for recommending HVAC duct cleaning related to mold?

Accepted Answer

Confirmed microbial growth (mold or bacteria) inside the duct system or on HVAC components

Answer

NADCA standards identify confirmed microbial contamination inside the HVAC system as the primary condition-based trigger for recommending duct cleaning.

Question 5

A mold inspector uses a psychrometric chart during an HVAC system evaluation. What primary calculation does this tool support?

Accepted Answer

Determining dew point temperature to predict where condensation and mold growth may occur on surfaces

Answer

A psychrometric chart allows the inspector to calculate dew point temperature from dry-bulb temperature and relative humidity, identifying surfaces at risk of condensation and subsequent mold growth.

(CMI) Certified Mold Inspector Practice Test

(CMI) Certified Mold Inspector Practice Test

CMI CMI HVAC Systems & Ventilation Inspection 3