You will need a custom code device type handler. There are a couple listed in the community contributed section.
First start by reading the overview faq for using custom code:
Then if that sounds like something you’d like to do, you can quick browse the community-created device types section of the forum using the HVAC tag and you’ll see the current fan offerings. (Once you get the list, look for ones that also have the tag “fan”).
Make sure you pick the quick browse list for DTHs (device type handlers), not the one for smart apps.
