Hearth dampers are fire-guarding devices which are used in just HVAC devices. They can be intended to stop the fireplace from spreading with the ducts. In a set temperature, the fire damper shuts and kinds a barrier that prevents the hearth from spreading throughout the ducts. Handbook dampers are adjusted https://air-control-dampers-for-e35677.humor-blog.com/35394027/air-control-dampers-for-engine-sheds-fundamentals-explained