1. The 70℃ circular fire damper is generally installed in the ventilation duct of bathrooms and connected to the duct flange.  
2. Standard Model: FHF WS-FK  
3. Performance: The valve is normally open; it closes automatically when the temperature reaches 70℃ and outputs a closing signal (if two groups of signals are required, please specify when placing an order). It supports 5-level air volume adjustment and manual reset.  
4. Microswitch Capacity: AC380V/3A