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A hand held anemometer can be used to see the flow then multiply by area to get the total flow. There are quite a few for under 20$ .


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Does this furnace have a condensate drain? I had a similar problem with a high-efficiency gas furnace, and the problem turned out to be a gummed up condensate trap. I disconnected the hose from the front end of the trap, and about a quart of water poured out of the drain line. I removed the trap, flushed it with water for about 5 minutes, reconnected, and ...



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