20 Dec '11, 8pm

Use of bathroom exhaust fan for ventilation in a small building #green

I questioned in a previous thread if a bathroom exhaust fan could suffice for exchanging air in a tiny, but well-insulated and tight 250 square foot dwelling. Someone confirmed, given the small space, that it should be fine and to put it on a timer as it wouldn't need to be constantly on. Another said: "assuming that the fan on a timer needs to be cycled on and off frequently (for example, every other 5min interval) during occupancy, to compensate for lack of low-enough cfm settings, how significant of an effect on power draw do those frequent start-ups have?" So, how much would such a fan need to be on to encourage adequate air exchange and would the power draw on a bathroom fan be more efficient than another method or not?

Full article: http://www.greenbuildingadvisor.com/community/forum/mecha...

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