We also have a exhaust odor throughout our entire first floor on very windy or snowy days. We have a side power vent from our oil furnace that is about 3 years old. We have always noticed the smell. Service men have been here several times sealing and cleaning, but have not solved the problem. We also have a carbon monoxide that always reads 0, but we worry about other health issues with such a strong odor. Any info would be very helpful! Who should we contact?
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