Firestat distributorsFirestat has a large group of trusted distributors who regularly purchase our duct limit controllers for their stores. Among these Firestat distributors are Dynacon Inc, Gemaire Distributors, Kele Inc, and Ferguson HVAC, just to name some of the larger ones. If you are looking to purchase a small quantity of Firestat units (ie: 100 or under), you may want to go to one of our larger distributors in order to get a lower cost per piece as well as a faster delivery time.

To view our Firestat adjustable duct limit switches, click here!

Senasys manufactures a line of Firestat adjustable duct limit switches. The adjustable temperature duct limit switch features a helix bi-metal element that senses rapid increases in temperature, such increases often caused by fire in a HVAC duct system. The duct limit switch operates a single pole, single throw (SPST) switch that opens when temperature rises. The adjustable duct limit switch can be set by the operator to sense 100°F to 250°F. The enclosure has an ambient temperature of -40°F to 190°F. And the element’s ambient temperature is 350°F.

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CEMCO Duct Limit Switches

The Firestat Duct Fan and Limit Thermostat Switches operate using the same physics to ensure HVAC safety. A helix bi-metal element senses a rapid temperature change. When the temperature changes the bi-metal expands and triggers a snap action switch and either opens or closes a circuit. These switches are commonly installed in air ducts designed to shut down heating, air conditioning and ventilation equipment in apartment complexes and other multiple dwelling units when air temperature exceeds the set point.

UL & cUL Approved
Made in the U.S.A.