Honeywell l4064b2210 – fan & limit controller the honeywell l4064b2210 is a fan and limit controller with 125 f fan on and 100 f fan off stops, 200 f high limit stop and 11 1/2 in. Insertion. For control of high limit and fan motor in all types of forced air heating systems. Features: the l4064b2210 includes three wiring terminal options available for easy installation–push-in receptacles for stripped wire, female receptacles for 1/4 in. Male flag connectors, and field add-on screw terminals. Adapts to many competitive mounting holes in replacement applications and available in a variety of fan and high limit setting ranges. Has manual fan switch that overrides fan control to keep fan running continuously.