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high velocity is a mistake imo. easy to install, hard to make work as well as conventional. i should mention i own my own business not just talkin out the ass. there is more air noise for sure. if you follow the manufacturers recommendations youll usually end up undersized. so you really need a company that does a lot of them. i myself dont. i have done a few and they work fine. little noisy but they work. its a last resort for me to put those in. if you re doin renovations than you shouldnt have a problem with conventional.
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