When performing a bottom blowdown, the valve closest to the boiler is always opened ___.

Pre-treatment equipment commonly includes ___.

An ear muff is a device inserted into the ear canal to reduce the level of noise reaching the eardrum.

The NFPA Hazard Signal System colors and numbers identify potential health (blue), flammability (red), reactivity (___), and special hazards (no special color).

A(n) ___ is a cooling system that chills water for cooling.

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.

The NFPA Hazard Signal System colors and numbers identify potential health (blue), flammability (red), reactivity (___), and special hazards (no special color).

A typical vacuum pump serving a condensate system is a ___-compartment condensate vessel, divided horizontally.

The condition of water column piping is determined by removing boiler cross tee plugs.

The main difference between how cooling systems operate compared to hot water heating systems is that cooling systems transport heat away from a building space to produce a cooling effect.