GFK - gravity backdraft damper to prevent air back draft in the system. Such fan configuration that includes KFK mixing chamber and GFK backdraft damper ensures fan motor overheating protection based on BY-PASS actuation, in particular when the motor is not running due to no power supply. This design enables backdraft damper shutting and hot air distribution to other premises through ventilation ducts when the motor is not running.
Operating logic of KAM filter with KFK mixing chamber and GFK gravity damper
When air temperature in the fireplace hood reaches the set point, the fan turns automatically on and distributes purified hot air from the fireplace to other premises. It turns off, when the temperature falls down below the set point. The BYPASS system is designed to protect the fan from overheating, for example, during power failure. In this case, the GFK damper is closed and hot air is moved through the bypass air duct past the fan. If the air supplied to the fan is too hot, the mixing chamber damper is opened, and cold air is supplied to the fan.
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