HVAC Excellence Gas Heat Practice Questions - HVAC Excellence Master Specialist - Gas Heat (Written Examination) Exam

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A condensing gas furnace is rated at 95% AFUE. Which design feature is most directly responsible for that high efficiency?

A standing pilot instead of hot-surface ignition A secondary heat exchanger that condenses water vapor from the flue gases A larger orifice that increases firing rate A natural-draft Category I vent system

Correct Answer:

A secondary heat exchanger that condenses water vapor from the flue gases

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