Did a preventative maintenance on a Lennox unit gas furnace. During the maintenance I clean the flame sensor cleared out the pressure switch port. Also did an amp reading on the inducer motor and the blower motor. I cleaned out the burner compartment as well as the blower motor. The supplied temp was 113°. Swapped out the filter which is 16 x 25 x 1. I system is running properly at this point in time. m#SL280UH110V60C-03 s#5911L23436.