Why do you offer a fan with variable speed?

Every fireplace and room combination has different heating and acoustical properties. We want to offer the owner the option to tune the fan speed to provide the best airflow and the most heat for their fireplace, at the lowest possible sound level. Lowering the speed also lowers the sound frequency from the fans which some people prefer. Do not try to control the speed of the fan by plugging the adapter into a dimmer switch or rheostat controlled outlet. The adapter will be damaged and the fan will not run.