Most of the exhaust gas leaks that I find seem to happen at the same locations over and over. A combustion analyzer can easily locate exhaust gas leaks.
How do you know if your equipment is leaking exhaust gas? The best way to know is to have it professionally checked. Another low-level CO monitor is the NSI 3000. Even though this web site looks like it was designed in the early 90’s without being touched since, it has some good information. There are numerous studies saying that low levels of carbon monoxide exposure cause health problems there are links to many such studies at CO-Experts Home Page. Seattle home inspector Charles Buell just wrote a post on this topic, where he tells the story of how a kitchen stove was producing CO levels at over 600 parts per million, but the UL listed CO alarm never made a peep.ĭoes this mean that low levels of carbon monoxide are safe? No. This means that if you have a furnace with a CO reading of 25 ppm in the flue gas, you could place the carbon monoxide alarm right inside the furnace’s vent and it would never go off.Įven at higher CO levels, UL listed CO alarms might take a long time to sound off – long enough for you to start experiencing symptoms of carbon monoxide poisoning. Underwriters Laboratory standard UL2034 requires carbon monoxide alarms to not sound off when exposed to carbon monoxide levels under 30 parts per million (ppm). Carbon monoxide alarms keep people from dying they don’t eliminate all health risks. The simple answer is that UL listed carbon monoxide alarms will not alert you to low levels of carbon monoxide. In a recent phone call like this, the seller even went so far as to ask me why he was still alive. What’s being insinuated in these cases is ‘you’re wrong’. The next day I get an accusatory call from the seller or their agent, asking why the brand new CO alarm never went off if there was a safety hazard at the house. I report a problem with a gas appliance, saying there is exhaust gas leaking in to the house, and I say it needs to be fixed because it’s a safety hazard exhaust gas contains carbon monoxide. This has happened to me dozens of times, so I have to assume it happens to other home inspectors around the country every day.
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