I need to hang 3 ceiling fans in my workshop. They will be mounted on the joist about 18' up so I would like a 6 foot downrod for two, and maybe 8 foot for the other. Home Depot didn't have one that long and what they had was $20 each so a no go on both. What pipe/conduit should I buy? The 3/4 emt I have is just a little too big to go into the ball hanger without some modification.