Meets requirements in Section 607.3.1. of the North Carolina Mechanical Building Code.

Made in U.S.A.

Manufactured in Eau Claire, WI.

Direct Customer Service

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Our Products

CEMCO offers high limit control duct switches that shut down HVAC systems in the case of high temperature.

View a product below to learn more.

Adjustable Temperature Duct Limit Control
Fixed Temperature Duct Limit Control

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Learn more about where our duct limit switches are used.


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We are always looking for our customer’s feedback. If you’d like to leave us a review to be posted online, please email us at info@senasys.com.

Purchased one of these units for my furnace. It is a quality product and great customer service provided as well.

Tyler A.

Home Owner

We needed 11 duct controls for an inspection of an apartment building. Company was easy to work with and helped us find what we needed to pass the inspection.

Alex R.


I’ve recommended the firestat product offering to multiple companies I have worked for. It’s a great product, and the service the company provides is outstanding!

HVAC Distributor

Our Distributors

Prefer to work with a distributor, visit one of our partners websites below.

    Our office hours are

    Monday – Friday

    8 a.m. to 4 p.m. CST


    A Division of Senasys

    1435 International Drive

    Eau Claire, WI 54701 USA

    +1 (715) 831-6353