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A flammability hazard on the NFPA Hazard Signal System indicates the degree of susceptibility of materials to explode or release energy by themselves or by exposure to certain conditions or substances.

___ are used in boilers to direct the gases of combustion for multiple passes to obtain maximum efficiency.

An aquastat controls the burner by sensing steam pressure in a hot water boiler.

In a natural-circulation hot water heating system, the ___ functions as a relief valve.

___ is the condition where a flame travels upwind and into the burner assembly.

Stop valves before and after a pressure-reducing valve allow servicing of the pressure-reducing valve.

___ are used in boilers to direct the gases of combustion for multiple passes to obtain maximum efficiency.

A(n) ___ is a hot water boiler fitting that serves as a boiler water setpoint temperature control system with an outside air thermostat.

___ is the condition where a flame travels upwind and into the burner assembly.

A(n) ___ is a hot water boiler fitting that serves as a boiler water setpoint temperature control system with an outside air thermostat.