AIR FILTER MONITORING SYSTEM AND METHOD FOR A WORK MACHINE

An air filter monitoring system and method includes a plenum, a pressurization blower, a first motor driving the pressurization blower, a first motor current sensor, a recirculation blower, a second motor driving the recirculation blower, a second motor current sensor, a speed selector, a fresh air filter, a recirculation air filter, a pressurization blower speed sensor, a recirculation blower speed sensor, and a non-transitory computer readable medium comprising a program instruction for permitting a controller to monitor the HVAC system. The program instruction is adapted to produce a first and a second motor control signal to drive independently the pressurization blower and the recirculation blower, respectively. The first and second motor control signals are a function of the speed sensor signals to maintain a constant speed. Comparing a first and second motor current sensor signal to a baseline and triggers a replacement action when either signal falls below a threshold.