High levels of carbon monoxide were discovered in the building, forcing residents from their homes late Saturday.
A low-rise Sandy Hill building was evacuated by Ottawa firefighters late Nov. 23 after a carbon monoxide alarm was triggered for the second time.
When they arrived, fire crews found carbon monoxide levels as high as 36 parts per million at the building on Robinson Ave., Ottawa Fire Services said on the social media site X.
The maximum safe exposure level to carbon monoxide in a home is 25 parts per million over an hour, and 10 parts per million in a day, according to Health Canada.
Crews had to call in Enbridge Gas workers to turn off the apartment building’s boilers and air exchanger.
Firefighters used high-powered fans to vent the building, and about two hours after arriving, confirmed carbon monoxide levels had dropped to zero, and residents were allowed to return. There were no reported injuries.
The fire service said the building superintendent was advised to have the building’s boiler and ventilation system inspected.
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