VEVOR 84 In Ceiling Fan without Light, 6-Speed Remote Control, Aluminum 8-Blade, Reversible DC Motor, Modern Low Profile Flush Mount Exterior Fan for Bedroom, Living Room, Patio, Indoor/Outdoor, Black
Please refer to the manual for installation instructions : https://www.vevor.com/pages/contact-us/WDDS84INCHLYBRQ4FV6
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No, the down rods cannot be combined or stacked.
This fan includes 3 separate down rods: 6 inch, 10 inch, and 20 inch. You can only use one at a time.
The longest available single down rod is 20 inch.