This is the first I have heard of them. It's a cool concept and the constant air flow should eliminate the condensation. Where would I put all of the stuff that normally gets piled on top of my cars in storage? (I know I am not alone on that one) I would think you could still get the car off the ground with one to prevent flat spots and stressed springs. I don't see any real functional disadvantage to them other than the space inside of a building. I store my cars, bikes, boats in the bottom of my bank barn with a fan and radio (to scare off critters and keep the car company). Birds and rodents are my opposition.
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