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

A ___ boiler is a boiler that uses the municipal solid waste that would normally go to landfills.

The boiler should be blown down when it is ___.

Electric boilers are classified by water volume and wattage.

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.

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.

A power burner is a burner ___.

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

Blowback is the ___ in a boiler that occurs after the safety valve has opened.

Blowback is the ___ in a boiler that occurs after the safety valve has opened.