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A modern gas furnace flame should be entirely white.

Depending on the type and size of a unit, a drip leg may or may not be installed at the furnace.

Match each of the following furnace-related terms with the statement that best describes it.

If the flue gas oxygen content is high, the presence of carbon monoxide is most likely an indication that there is a lack of air.

Stack temperature is directly related to the amount of excess air.

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.