My new extraction fan showed up yesterday. It moves a lot of air but a bit noisy on full power. This fan did not come with a built in speed control like the last one. So I paired it with an old variac (rheostat) that I had. Works really good. Excellent speed control over the whole range, no buzzing or humming, and very quiet at about half speed. I have to get a little imaginative with the mounting but WTF. Now just need to get another fan for circulation.