Reznor 123973 Limit Switch Els PW 29614 Does this prefilter require two

Does this prefilter require two units for installation

Key Benefits Dependable Ignition Sequence: Features a 3-trial ignition attempts logic (3TRY) with a 5-second TFI to ensure consistent burner start-up in varied environmental conditions

PopTop Quick-Connect Design: Allows for immediate actuator attachment and removal

Built from high-grade aluminum

Proven Reliability: Engineered specifically for gas furnace pilot components

Reznor 123973 Limit Switch Els PW 29614 Does this prefilter require twoThe Reznor 123973 Limit Switch is a critical OEM replacement component engineered for precise thermal regulation within Reznor unit heaters and furnace systems. This 105 160F AUTO Fan & Limit Control functions as a high limit safety device, automatically cycling the blower fan and interrupting the burner circuit if internal plenum temperatures exceed safe operating parameters. Designed for professional HVAC equipment repair, the 123973 ensures proper