while the factory-set draft proving switch ensures the burner only activates when sufficient airflow is established

Field-Service Ready: Includes all necessary hardware for a standard manifold pressure adjustment and orifice swap

this 4-blade fan is designed to move significant air volume while maintaining low static pressure

The Fenwal 35-665036-111 is a microprocessor-based Hot Surface Ignition (HSI) Control engineered for precise sequencing in gas-fired HVAC systems

and potential condensate drainage issues

Carrier EC31EZ120 Check Valve 320788-703 while the factory-set draft provingThe Carrier EC31EZ120 Check Valve is a genuine OEM replacement part specifically engineered for industrial refrigeration and high performance HVAC systems. Designed with a precise spring loaded mechanism, this valve ensures reliable unidirectional flow and prevents damaging backflow in critical liquid or suction line applications. As an HVAC check valve built to exact factory specifications, it provides a seamless drop in replacement for Carrier