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Air or gases flow from a location of low pressure to a location of high pressure.

Sensible heat is heat that ___.

___ combustion is combustion that occurs when fuel is burned using only the theoretical amount of air.

The ___ are environmental standards for ambient pollutant emissions from new sources of emissions.

The boiler should be blown down when it is ___.

Electric boilers are classified by water volume and wattage.

The ___ are environmental standards for ambient pollutant emissions from new sources of emissions.

A ___ check valve is a check valve that prevents backflow through the use of a conical or cylindrical brass disc held in place by a spring.

Natural draft produces greater amounts of draft in the winter than in the summer.

A power burner is a burner ___.