Negligent HVAC Installation Leads to Carbon Monoxide Poisoning

ByJoseph O'Neill

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Updated onOctober 27, 2017

Negligent HVAC Installation Leads to Carbon Monoxide Poisoning

This case involves a family in Wisconsin that was had their roof replaced with CertainTeed shingles during the summer months. There was a cap vent on the roof which was removed by the roofing company, replaced, and painted during the roof repair. Several months later, the family had a new oil furnace installed. The installation company noticed that the furnace stalled on multiple occasions, and investigated the exhaust vent for blockages. Upon investigating the vent opening on the roof, they found that the cap vent, which was replaced by the roofing company, was flush with the roof – causing most of the fumes to remain trapped inside of the house. The family later tested positive for low-grade carbon monoxide poisoning.

Question(s) For Expert Witness

1. Please briefly describe your experience with ventilation that would prevent such an incident.

2. Are you able to opine on CO exposure in relation to the lack of ventilation?

Expert Witness Response E-139043

inline imageAs a certified InterNACHI home inspector, I am required to know and understand the basics of ventilation. Proper ventilation of gas fired appliances are covered under most jurisdictional Mechanical codes. Furthermore, the manufacturers installation instructions should always be followed when altering a ventilation pipe from a gas or oil fired furnace. Moreover, ventilation pipes are required to extend specific distances above the roof surface. Inadequate ventilation can lead to CO and CO2 buildup if a gas fired appliance is not properly ventilated. Normally CO2 levels outdoors are stated to be 200 ppm to 400 ppm but that level has been rising. Indoor air can be affected by many factors but typically range between 600 ppm and 800 ppm, however in an inadequately vented space 1000 ppm is common. As for CO, 9ppm is the maximum recommended indoor CO level.

About the author

Joseph O'Neill

Joseph O'Neill

Joe has extensive experience in online journalism and technical writing across a range of legal topics, including personal injury, meidcal malpractice, mass torts, consumer litigation, commercial litigation, and more. Joe spent close to six years working at Expert Institute, finishing up his role here as Director of Marketing. He has considerable knowledge across an array of legal topics pertaining to expert witnesses. Currently, Joe servces as Owner and Demand Generation Consultant at LightSail Consulting.

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