What is the Best ETC dimmer to use to control a Fan or Motor?
SCR-based dimmers are the best to use in this situation based on the fact that it may receive a non-linear kick-back in voltage. For this reason the D15 and D20 modules are your best choice.
This kick-back may damage the LWD devices so they should not be used. If the motor or fan does not run as slow as you would expect, then you may also try a ghost load of about 100-200 Watts.
Please remember that running a fan or motor from any dimmer may damage the motor or fan depending on its type and usage.