Mc/ac and Non-Metallic Sheathed Cable Support | Cable Support | Controls 5 a Fan. Rotate On/off; Rotate to Adjust Fan Speed. Fully Variable (For Use With Multiple Ceiling Paddle or Exhause Fans). Factory Set Minimum Speed | Use Through Knockout to Connect Box to Conduit Coupling; Use With a Locknut to Connect Two Boxes Side by Side or Back to Back; Use With a Locknut to Connect Fixture Housings in Continuous Runs; Rigid Conduit Threads (Nps)Furbay Electric Supp