Subpart 4-9 Flame Safeguard Controls for Gas-Fired Boilers

Subpart 4-9 Flame Safeguard Controls for Gas-Fired Boilers

Department of Labor
4-9.1Application of this Subpart.4-9.2Devices required.4-9.3Pilot or torch to be proven.4-9.4Trial-for-ignition period.4-9.5Burner flame failure controls.
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