The Grain Aerator unit is easy to use. Just plug it in to any 115 volt outlet and it goes to work immediately. This fan pulls out large volumes of hot, damp air keeping grain cool up to a depth of 18'. The head houses a 12" diameter fan with a 1/12 HP heavy-duty motor. The 6' tube is sold separately — the first 36" is a solid pipe (top) and the other 36" is a perforation pipe (bottom).