One should be careful when using the small backpack type blowers as they often send the exhaust gases down the blower tube. Hence the honey becomes contaminated with CO and petrol residues. I purchased a Homelite last season and had to modify the exhaust. I would like to try the electric blowers and have the generator on the truck and NOT have 2-stroke fumes all over me all day long.Does anyone know what cfm is needed to remove bees from supers on a commercial scale? Peter.