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Early in 1995 the Ministry of Consumer and Commercial Relations (MCCR) announced a program to replace up to 20,000 mid-efficiency gas furnaces in Ontario, because their plastic vent pipes were prone to failure, and might leak carbon monoxide into the house. Other sources indicated the number might have been as high as 40,000 - but no one knows for sure.

The crux of the problem was that no other type of vent pipe had been approved for use with mid-efficiency furnaces.

Hundreds of ...