Heating, Ventilation, & Air Conditioning (HVAC) Inspection Flashcards
7 cards from real CHI practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Heating, Ventilation, & Air Conditioning (HVAC) Inspection flashcards as text
Which type of filter has the highest MERV rating capability and provides the best filtration for an HVAC system?
Answer: HEPA filters
HEPA filters achieve MERV 17-20 ratings, capturing 99.97% of particles 0.3 microns and larger, making them the highest-efficiency option for HVAC systems.
When inspecting a boiler system, what does a consistently high-pressure reading on the pressure gauge indicate?
Answer: The expansion tank may be waterlogged or failed
Consistently high pressure in a boiler system typically indicates a waterlogged or failed expansion tank, which can no longer absorb pressure fluctuations as water expands when heated.
What is the purpose of the flue gas spillage test performed near a draft hood on a natural draft furnace?
Answer: To detect if combustion gases are backdrafting into the living area
A spillage test—typically using a match or smoke pencil near the draft hood—determines whether combustion gases are being properly exhausted or are spilling back into the living space.
A home inspector observes rust staining and corrosion on the exterior of a central air conditioner's refrigerant line set insulation. What does this MOST likely indicate?
Answer: Condensation forming due to damaged or missing insulation
Rust and corrosion on line set insulation typically indicates that the insulation is compromised, allowing condensation to form on the cold suction line and cause moisture damage.
Which condition would require a home inspector to recommend evaluation of a ductless mini-split system by a qualified HVAC technician?
Answer: Oil staining is visible around the refrigerant line connections at the outdoor unit
Oil staining around refrigerant line connections indicates a refrigerant leak, since refrigerant oil travels with the refrigerant and leaves visible residue at leak points.
What is the function of a barometric damper (draft regulator) found on an oil-fired furnace flue?
Answer: To regulate draft by allowing dilution air to enter the flue when draft is excessive
A barometric damper opens to admit room air into the flue when draft becomes too strong, maintaining a consistent, correct draft level for proper burner operation.
During an HVAC inspection, the inspector notices the thermostat is set to 70°F but the system is not reaching that temperature on a mild day. What should the inspector check FIRST?
Answer: Air filter condition and return air restrictions
A clogged air filter is one of the most common causes of HVAC performance issues and should always be checked first before investigating mechanical components.