The efficiency of the fan is going to be reduced greatly if you are going to be blowing the air through any kind of duct work. If you just have that blowing out of your grow room and into open air, then you should be alright, but if you are trying to blow air into a duct system with that fan, its not going to work out so well because it won't be able to generate enough pressure behind it to move as much air as it says. You'd be a lot better off getting a squirrel cage fan.