Generators aren't the only equipment that can cause carbon monoxide poisoning. If not cleared, vents and pipes for gas appliances can also lead to carbon monoxide poisoning.

The carbon monoxide level inside the Jolly's house ... "Your HVAC system or your water heater, they all have exhaust pipes that lead outside," said Mason Muench, Campbell Fire/Rescue captain.

Carbon monoxide poisoning is a colorless and odorless killer of hundreds of people every year. It strikes without warning.

A key concern for these is the risk of carbon monoxide seeping ... locating the vents outside, especially if snow has already accumulated. Typically, you should check pipes and vents for furnaces ...