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A humidifier that sprays small water droplets into the air is called a(n) ____ humidifier.

In some furnaces, an opening in the flue, called a(n) ____, helps keep constant pressure in the combustion chamber and prevents ambient air from reaching the furnace flame.

Which of the following statements about heat pump compressors is false?

A typical forced-air furnace is equipped with a(n) ____.

With no excess air dilution, the ultimate carbon dioxide content for natural gas is approximately ____.

Which type of furnace takes in return air from the top and forces it out near the bottom?

A(n) ____ can open and close a gas valve, control a spark or hot-surface igniter, and monitor interlocks.

Which type of furnace can operate to produce either full heat output or produce at a fixed level that is less than full heat?

A furnace’s need for fresh air can result in ____.

A(n) ____ draft regulator opens when pulled open by the negative pressure of flue gas suction.