It happened on Monday around 6:40 a.m. on the 500 block of Green Street.
The Norristown Fire Department says 10 people were exposed to high levels of carbon monoxide due to fumes from a blocked chimney.
Three of the people, including the infant, were taken to an area hospital to be evaluated. No word on their conditions at this time.
The furnace has since been shut off and the home has been ventilated.
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