Screw Ceiling Fan Downrod

Craftmade 18quot; downrod 1/2quot; male screw end 1/2quot; slotted end, ceiling fan downrod length extension rod selection guide, installing a ceiling fan with a light dengarden. How to choose and install a ceiling fan the homebuilding. Hunter 24quot; downrod white 3/4quot; male end 3/4quot; slotted end.