A ___ is an accepted reference or practice.

___ draft is air that is pulled through a boiler furnace with fans located in the breeching.

A typical standard burner operating control package consists of only two separate pressure controls the operating control and the high limit control.

The boiler pressure should always be ___ the header pressure when cutting a boiler in on the line.

The boiler pressure should always be ___ the header pressure when cutting a boiler in on the line.

Natural gas is a colorless and odorless fossil fuel.

Plate-and-shell exchangers usually consist of a cylindrical shell containing a heating or cooling fluid.

Natural gas is a colorless and odorless fossil fuel.

A compression tank is normally full of water to feed into the boiler during a low water condition.

A backflow preventer with an intermediate atmospheric vent consists of four independent check valves within the body and an atmospheric vent between the check valves.