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Re: Crawlspace vent fan
I encountered these for the first time only a couple of weeks ago. New home with four of them in the crawl. There were no indications they were needed here more than any other home. Soils was dry wherever I pulled back the barrier and also had the normal venting. This was higher-end home with some very nice touches and I think this was a case of a builder actually doing more than required. It happens...nice to see occasionally.
I temporarily adjusted one until it ran and they are very quiet. Thinking about it now, I suppose I should have tested every one of them? Yep, will have to do that if I see them again.
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