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A gas furnace flame may jump around above the burner because there is insufficient primary air.

In a gas-fired, forced-air furnace, fuel gas is piped to the furnace and kept under high pressure.

A masonry chimney is a Class B chimney.

Meats and poultry are very prone to spoilage from enzyme action and dehydration.

When heat is called for, a solenoid valve in the gas valve opens to allow fuel gas to pass into a manifold.

Which of the following statements about heat exchangers is false?

A post-condenser loop is also known as a(n) ____ loop.

A demand defrost controller activates the defrost cycle based on the number of times the cabinet door is opened.

Which of the following types of defrost systems bases the frequency of the defrost cycle on the number of times the cabinet door is opened?

Domestic refrigerators commonly use ____ condensers.