Did a preventative maintenance on Lennox unit system is 7 years old in fair condition. Cleaned the flame sensor. Cleaned the burner box and blower motor housing. Did a amp check on the blower motor and inducer motor both met the furnace name plate. 16x25x1 filter. System is tested and operating properly at this time. Lennox Model # 180UH070P36A Serial # 1716J16223 Bill out