It's said that induction fans (draft inducers) increase efficiency - how?

HVAC Guy · 2007-12-20T05:04:18+00:00

I haven't seen any posts in these groups in months, so I might just betalking to myself here, but here goes.Many articles on furnaces and furnace efficiency seem to link high(er)efficiency with draft inducers. In other words, a draft inducer(draft induction fan) helps or adds to the efficiency of a furnace.I don't see how a small blower motor that runs for a few minutes atthe start of a heating cycle is going to help increase the extractionof thermal energy in the heat exchanger.I can understand that the function of the draft inducer is to startthe evacuation flow of combustion gasses up the cold flue untilconvective flow can be maintained on it's own. I can't really see thedire need for such a fan, but I guess someone thought it was a goodidea. So what's the logic behind the draft inducer as it pertains toincreasing the efficiency of a natural gas furnace?

Dec 20, 2007 21 Replies

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Zyp 18 years ago

You [HVAC Gay Guy] are a clueless piece of s**t.

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HVAC Guy 18 years ago

It must frustrate you that you can't come back with anything better than that.

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