Performed maintenance on one Lennox gas fired furnace checked electrical and mechanical components and electrical connections cleaned burners and igniter and flame sensor also checked blower wheel and air pressure switch and safety turned system on and checked system operation and checked for carbon monoxide none found and left system working View visual findings from this job here - https://visionshare.xoi.io/?id=XA-213F-887D7D08F4324A1982223B09A47AE7EF