Performed furnace clean and tune; inspected the exhaust and intake PVC ensuring all connections were secured, I then removed and cleaned the burners along with the flame sensor, next cycled the system on and checked gas pressures, as well as performed a combustion test verifying no CO in the airstream. This sytem is currently operating normal and heating at 50 degrees at this time. I did take a snapshot of the systems blower wheel this picture shows a substantial amount of dust on the wheel this could potentially cause up to 30% reduction of efficiency on the system I did include an estimate for an electronic air cleaner to bring these levels of dust down in the home. Job complete UNPAID