The Chain Controlled “Thermostat”
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We see these pop up once in a while with the question of “What the heck is it”? Many had the letters “D” and “C” – Draft and Check. There would have been a chain through each hole to control the draft or damper of the furnace without having to go to the basement.
![](https://castironcanada.com/blogs/wp-content/uploads/2019/09/Chain-controlled-thermostat-1.jpg)
![](https://castironcanada.com/blogs/wp-content/uploads/2019/09/Gurney-mounted.jpg)
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