White-Rodgers 5D51-35 Fan and Limit ControlWhite Rodgers 5D51 35 Fan and Limit Control is a universal type device that regulates furnace fans or blowers while serving as a high limit safety control. With a temperature range of 50 to 265F and a Close On Rise contact configuration, it delivers reliable performance in compact spaces. UL and CSA approved, this unit is ideal for residential and commercial HVAC installations where safety and compliance matter. Designed for narrow space limitations,

and a wiring harness that matches OEM specifications for a trouble-free retrofit

it handles a broad temperature range (-40 to 200°F) and a generous setpoint range (-40 to 220°F)

Built from quality materials

It is UL approved for US and Canada and RoHS compliant

Dual pressure ratings of 25 PSI on the boiler side and 150 PSI on the water side cover common boiler room requirements

This complete boiler safety part includes a rugged high limit switch with auto reset

The 24V control coil simplifies integration into standard electrical control circuits

it features a 1-1/4 inch nominal size

Designed for water media

the IAH-6 integrates with standard ductwork and mounting patterns

Inlet/outlet: Inlet filtered screen

Vent & installation: 1/8" vent connection