Help on Electronic Problem

Gas log fireplace?
Full time pilot light? Or an electronic ignitor that lights the pilot?

Are you sure the static is not being caused by an electronic ignitor?

Can you light the fireplace and leave off the fan? If so try that first. No static, then turn on the fan.....

If you are positive the static is being caused by the blower fan call a service tech and have him check out the blower fan circuit. Static can be caused by arcing due to a lose connection or poor contact of a switch or relay contact. Static is RFI and can be transmitted trough the air or go back out through the wiring of the house
.

Vari-speed on the fan motor?

It is radiated rf from the blower motor. This rf is not coming in on the line but is radiated directly to your system. Sometimes moving cables around or moving your preamp around could help but this is a real difficult problem to eliminate other than not running the blower when listening

Get your equipment off of the same circuit the FP blower is on.