Performed furnace start up; customer stated that they would like their humidifier wired into Nest Tstat I ran a new 8 wire for this and spoke with Nest we will have to return to finish the wiring, I then inspected the exhaust and intake PVC ensuring all connections were secured, I then sniffed the gas line for possible leaks, next I cycled the system on and checked gas pressures and did make adjustments on both stages, lastly performed a combustion test verifying no CO in the airstream. This system is currently operating normal at this time. Job complete