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Leak at Combustion Air Supply in Summer

Mike Lamb

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Chicago is in the middle or end of a terrific heat wave and air conditioners have been running nonstop.

At first I thought there was some kind of leak at the air-conditioning condensate but it turns out the water is coming from the combustion air concentric supply pipe for a Cat IV furnace.

I'm guessing humidity and condensation is being drawn in and leaking on top of the furnace but it does seem odd. Any comments on this?

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