Fenwal 35 605601 103 Control Els PW 17895 Utilizing an OEM grade Honeywell fan Utilizing an OEM grade Honeywell fan motor ensures the specific static pressure and CFM requirements of the NXS frame 4 chassis are met without compromising the drive's protective housing integrity or airflow dynamics The Cleveland Controls AFS 305 is a high performance differential pressure switch engineered for precise monitoring of air flow and pressure in commercial HVACR systems Key Benefits Precise Microprocessor Control: Delivers consistent 15 second pre purge and 7 second TFI sequences for optimized burner safety this ignition module features a 15 second pre purge to clear the combustion chamber and a 7 second trial for ignition (TFI) to ensure reliable flame establishment