Dear PoPville – Should I Be Concerned about serious corrosion on the furnace draft hood?


“Dear PoPville,

Cleaning out my basement I noticed serious corrosion on the furnace draft hood. Should I be concerned about carbon monoxide? Any recommendations on furnace repair company’s?”

10 Comment

  • if it is corroding from the inside then possible concern with incomplete combustion,Moisture would be a by-product. As draft hoods maintain a negative pressure, theoretically a hood could look like swiss cheese and only draft better.

  • First you need to find out whats causing water to drip on the hood. Last winter my furnace stopped working out of the blue. Well once I went into the util closet in basement and saw that there had been a constant drip from a pipe above the pump for the furnace and caused major corrosion where thee pumped eventually seized up. I had to replace the leaking pipe and also the pump.

  • In the meantime, you could probably do what they do on that show Moonshiners, which is make a paste of flour and water and spread it over the leaks.

  • Personally, when it comes to something that could kill me in my sleep or burn down my house, I would go straight to a professional and not rely on anonymous advice. I have used Climate Heating and Air for years and can recommend them.

  • gotryit

    The source of the rust can be a number of things – too many for me to try to guess at.
    As far as carbon monoxide, why not get a $40 carbon monoxide detector to put near your utility room? It’s a small cost to give you peace of mind. Even when you don’t have a rust problem.

  • Everyone using the commonly available CO detectors should be aware that the level at which they sound the alarm is only when the levels rise to imminent, life-threatening concentrations. This is due to a number of complaints from fire fighters unions who were tired of getting called out to houses with low level CO problems. The concern is that low level CO concentrations can cause serious health issues over time and are statistically quite a bit more deadly in the long run. You can purchase more sensitive CO alarms, but you have to look for them. Here’s a good article about it:

    Oh, and back to the topic at hand- if that is an actual photo of the furnace in question, that looks more like something dripping on the vent than corrosion from the inside. Even if not, as was stated before, if your vent is drafting properly, a small hole in the pipe shouldn’t have an effect on where the combustion gasses go. Still, you should have a yearly HVAC service call to check everything out.

  • I’ve used Jimmy Gusky HVAC a couple of times for my furnace and been really happy with them. The first time I called a few furnace guys and Gusky came and fixed my furnace (it was a minor issue with the sensor) before I even got a call back from the other companies.

  • From experience I can tell you yes you should be concerned. I found out last year when my 2nd water heater died in 8 yrs that my chimney was blocked causing the CO to back up into the house and corrode both the water heater & furnace. Total repairs were >$7,000 but well worth it.

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