Went for a tune up call today for heat. Tested for static pressure system is max when in heat. All electrical components are passing for manufacture specifications. Did a combustion test is within range. Inspected heat exchanger no cracks/leaks were detected. Temp split and is passing for specifications on furnace. Did replace filter for customer. Did notice blower wheel has a lot of dust built on the blower wheel. Will recommend a cleaning. As well a UV light to help sanitize system.Cleaned flame sensor and pressure switch hose. System is up and running before departure. Thank you for choosing LBA services-Johann