For this job, I performed maintenance on the furnace. After checking everything, I found that the burners are rusted and showing flakes on the outside and inside of the burners. I also had to adjust the gas pressure as well, because it hasn’t been service since two years ago. I did recommend to the customer replacing the burners, and he gave the OK to have that replace. Part and labor is under warranty The humidifier pad has been replaced The filter has been changed Filter size is 16 x 25 x 5 AirBear The furnace is working in normal operation.