Question about Lomanco PCVI POWER CRAWL SPACE VENT Fan

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Humidity build up in crawl space

Rectrangular 1680 square foot crawl space which is 5 feet high.I have two vents which have 110 cfi fans in each vent.I am thinking of getting two fans 220 cfi which will go into another vent locatied on the side of the crawl space. I dont know if that is going to be enough drawing power to do any good. One more thing is that the two fans (220 cfi)which are on a single humidstat.

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  • thomas_sm520 Jun 22, 2009

    The floor of the crawl space is stones with a vapor barrier sheet on the top.,There are no heating or cooling systems in the space. Being that i live in tennesse we have a humidity problem.I dont think my two little fans 110 cfi is enough,they are located at the far end of the rectangulaf shaped crawl space.

  • thomas_sm520 Jun 22, 2009

    I am impressed with your follow through on my problem.It seems to me that the four fans would encompass the area in question.I again thank you for more feedback and i will keep you in mind if any further problems occur.

  • boss dad May 11, 2010

    what kind of floor is in the crawl space --- also, what kind of area are you in and what is the ground like around the crawlspace --- any heating cooling equiptment in the crawlspace --- we need to first determine the source of the humidity before considering types of ventilatio or circulation

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You have to get a constant flow of air through there to prevent that build-up. By the time the humidistat calls for the fans to come on you have already lost the game. you need plenty of venting on all four sides to kep the air moving and preventing buildup of humid air. the 2 fans of 220 each are sufficient, put place them apart so you draw air in from all the vents (at least 4 intake vents ) and provide for movement of the full crawlspace area air ---- that is the key for your sitation. Make sure you have enough vapor barrier over a good base of stone----4 mil plastic or heavier and about 3 inches of stone. All in all, check on what it would cost to have concrete poured, especially if you get a lot of cold air conditioned air seeping down from up above and causing condensation ptoblems.

Posted on Jun 22, 2009

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Yes we had that problem a couple of times a couple of years ago and installing another unit cut it less than half.

Posted on Jun 22, 2009

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