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Fan & Limit Controls

Available130 products
Fan and limit controls dictate when the blower fan operates to ensure furnace systems run efficiently and safely. They feature a temperature sensor that can turn off the burner or furnace if temperatures exceed safe limits. They come in several different form factors that allow for installation in several places throughout the heating system.

Plenum Fan & Limit Controls

Plenum Fan & Limit Controls
Plenum fan and limit controls mount into the wall of a plenum and control when the blower fan is turned on and off. They feature a temperature probe that inserts through a hole in the plenum and measures the temperature of the furnace airstream. Depending on their configuration, they can have fixed or adjustable trigger temperatures.

Fan and Limit Control

Automatic Reset

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Plenum Limit Controls

Plenum Limit Controls

Plenum limit controls mount through the wall of a duct or furnace plenum and turn the fan off when the trigger temperature is reached. They feature a large base with notches or holes for mounting hardware to pass through and hold them in place. This provides the temperature probe with a solid base to withstand high airflow. They are commonly used as protection devices to turn systems on or off when temperatures exceed or drop below their setpoint.

Limit Control – Board Mount

Automatic Reset

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Limit Control – Plenum Mount

Manual Reset

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Surface Mount Limit Controls

Surface Mount Limit Controls
Surface mount limit controls provide fail-safe controls for temperatures above the safety limit. They operate using temperature-sensitive metals that change shape and disconnect the connected circuit when the trigger temperature is reached. They are installed on flat surfaces using two mounting holes and fasteners to hold them in place. Depending on their configuration, their trigger temperature can be fixed or adjusted, and their reset can be manual or automatic. They are commonly used as protection devices to turn systems on or off when temperatures exceed or drop below their setpoint.

Limit Control

Automatic Reset

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Manual Reset

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Adjustable Limit Control

Automatic Reset

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Limit Control with Fan Bypass

Automatic Reset

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Surface Mount Fan Controls

Surface Mount Fan Controls
These fan controls mount to flat surfaces and operate fans based on surrounding air temperature. When the air temperature is cooled sufficiently, they stop the fan to ensure it only runs when needed to improve overall system efficiency.

Fan Control

Automatic Reset

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Flame Rollout Limit Controls

Flame Rollout Limit Controls
Flame rollout limit controls are installed into a furnace or combustion heater and turn the system off when flames are detected outside the combustion area. This prevents furnace runaway and flames from spreading beyond the combustion area.

Flame Rollout

Manual Reset

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