Quote Originally Posted by BobBong
I've been running an 8" Elicent fan on a ceiling fan control dimmer without any problems.. I never run the fan less than 50% Power though as doing so reduces the quality of airflow greatly.

Dunno about fires though..
If you are using an actual ceiling fan dimmer, then you are good. They are designed specifically for the purpose you are putting them to (except for the ceiling part )

There's actually a whole article about it on the main cannabis.com website. Cannabis.com dimmer for fan