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subcool 01-28-2013 10:32 PM

How does this flame look to you?

beenthere 01-29-2013 05:40 AM

I can't tell much by the flames. I've seen flames like that produce low amounts of CO, and high amounts. Need a combustion analyzer to know how good it is or isn't burning.

techpappy 01-29-2013 11:14 AM

Flames look good but, as Beenthere said, you can't really tell without using a flue gas analyzer. However, I would be more concerned if the flames were burning lazily/orange/ color.

hvac benny 01-29-2013 03:33 PM

I've seen perfectly blue flames that turned out to be 20,000 btuh's over fired (gas appliances are not permitted to be over-fired, but can be under-fired by up to 10%). As a DIYer you aren't going to buy a combustion analyzer, but you could clock the input of your furnace at the gas meter to determine input.

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