CMI CMI HVAC Systems & Ventilation Inspection

Question 1

Why are HVAC duct systems a critical concern during a mold inspection in a water-damaged building?

Accepted Answer

Ducts can distribute mold spores throughout the entire building, contaminating previously unaffected areas

Answer

HVAC systems only affect outdoor air quality, not indoor

Answer

Mold cannot grow inside metal ductwork due to the surface chemistry

Answer

Ducts are only relevant if the building is older than 30 years

Question 2

Which component of a central air handling unit (AHU) is most prone to microbial growth due to perpetual moisture accumulation?

Accepted Answer

Drain pan and cooling coil

Answer

Supply air plenum

Answer

Outdoor air damper

Answer

Duct insulation on supply lines

Question 3

What is the significance of a negative building pressure in relation to mold growth potential?

Accepted Answer

Negative pressure causes infiltration of humid outdoor air through cracks, increasing moisture load and mold risk

Answer

Negative pressure dries out the building, preventing mold growth

Answer

Negative pressure has no relationship to mold growth

Answer

Negative pressure is only relevant in industrial settings

Question 4

When inspecting flexible ductwork in an attic, what mold-related concern is unique to this material compared to sheet metal ducts?

Accepted Answer

Flexible duct liner can absorb moisture and harbor mold growth that is difficult to remediate

Answer

Flexible ducts never develop condensation because they are not rigid

Answer

Flex ducts are antimicrobial by design and do not support mold

Answer

Only the exterior of flexible ducts can become contaminated

Question 5

What does a high-efficiency MERV 13 filter do to help prevent mold growth in an HVAC system?

Accepted Answer

It captures a high percentage of airborne mold spores before they can settle on wet cooling coils

Answer

It eliminates the need for duct cleaning

Answer

It reduces humidity by absorbing moisture from the air stream

Answer

MERV ratings are only relevant to dust, not mold spores

Question 6

An inspector finds standing water in the condensate drain pan of a rooftop unit. What is the primary corrective action?

Accepted Answer

Clear the drain line obstruction and slope the pan correctly to eliminate standing water

Answer

Add biocide tablets to the pan to kill any mold

Answer

Seal the drain pan with waterproof coating

Answer

Replace the entire AHU immediately