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A therm is equivalent to 100,000 Btu.

The most recent amendments to the Clean Air Act occurred in 1997.

Safety valve capacity is the amount of ___, in pounds per hour (lb/hr), that the safety valve is capable of venting at the rated pressure of the safety valve.

The range of pressure on a vacuum switch on a vacuum pump is usually 2″ Hg to 8″ Hg.

An outside-stem-and-yoke valve is a ___ valve that indicates whether it is open or closed by the position of the stem.

A photocell sensor senses ___ light.

The level of the water in a ___ indicates the water level in the boiler.

___ regulations place restrictions on the design and installation of fuel oil tanks.

Specific heat has no unit of measurement since it is a ratio, but it is almost identical numerically to the heat capacity because of the way the Btu is defined.

___ regulations place restrictions on the design and installation of fuel oil tanks.