Have you experimented with it on the "auto" mode? If not, you'll probably enjoy the furnace alot more. On "auto" the fan will only come on when temp difference is detected and the speed will vary according to the difference. It will cycle on and off as needed, per the thermostat setting & not continuously blow. Hope this helps?
2012 FR Flagstaff T12SDTH
1996 Shadowcruiser Pop Up Truck Camper
1967 Newell Motorcoach
2003 Ford F150 5.4 V8 Triton Super Cab
2004 Nissan Titan LE 5.6 V8 4x4 Crew Cab