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___ air controls the amount of fuel oil capable of being burned.

A(n) ___ metering device is a metering device with a fixed opening that acts as a restriction in the liquid line between a condenser and an evaporator.

When heat is added to a liquid, the liquid hardens and becomes a solid.

___ is the process of reducing fuel oil into a fine spray of minute particles.

A(n) ___ metering device is a metering device with a fixed opening that acts as a restriction in the liquid line between a condenser and an evaporator.

A feedwater system is a boiler system that collects, controls, and distributes the steam produced in a boiler.

A feedwater system is a boiler system that collects, controls, and distributes the steam produced in a boiler.

Rusting of boiler metal is caused by oxygen in boiler water.

A feedwater system is a boiler system that collects, controls, and distributes the steam produced in a boiler.

Unburned fuel oil that is heated in a furnace will ___.