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A ___ valve must stay open until there is a drop in pressure of about 2 psi to 4 psi below the opening pressure.

A face mask is a personal protective equipment device that provides respiratory protection from airborne contaminants.

Ammonia-water absorption chiller systems are commonly used for large applications where mechanical compression systems are not as efficient.

A ___ is a narrowed portion of a tube.

A ___ tank is a hot water system tank used to absorb changes in water pressure in a forced-circulation hot water heating system.

The types of mechanical draft are forced, induced, and a combination of forced and induced.

A ___ tank is a hot water system tank used to absorb changes in water pressure in a forced-circulation hot water heating system.

A(n) ___ is a common type of heat exchanger used to heat the air in a building space.

Rotary cup burners atomize fuel oil using a spinning cup and high-velocity air.

Rotary cup burners atomize fuel oil using a spinning cup and high-velocity air.