High levels of CO emissions from rooftop boiler pulled into building



Reference number
II-1263238-2021 (#24277)

Location: Burnaby

Regulated industry sector: Gas – Natural Gas System

Incident overview

A hot water boiler in a rooftop mechanical room was emitting high levels of CO out to the rooftop, where a nearby rooftop air handler fan pulled the CO into the building, setting off alarms. The likely cause of the hazardous CO levels was a faulty gas valve that led to improper combustion.