Completed furnace, maintenance and inspection. I changed out humidifier panel with customer provided panel. I checked air pressure and temp splits. I cleaned flame sensor and wiped down furnace. I tested amp draws and components. With customer permission I replaced the drain line for the humidifier and attached it to the condensate drain line for the AC. I changed the drain line from vinyl to PVC for a permanent solution. Air pressure is over the max. Ductwork and blower wheel are very dirty. I showed customer pictures of the dust in the ductwork and blower wheel. I explained our special with the UV system. Customer opted to go ahead and schedule the duct cleaning, UV system, and blower wheel cleaning for Wednesday morning next week.