Heat exhaust and circulation system for composting chamber

The present invention relates to a heat exhaust and circulation system for a composting chamber. The composting chamber includes a roof, an enclosing wall installed under the roof to define an inner space thereof and at least one ventilation device fitted on a roof thereof. The ventilation device further has a hollow tubular structure in which at least two ceramic meshed plates in a stack-up arrangement are fitted. The sizes of ventilation channels can be properly adjusted by controlling the correspondence of meshes of the stacked ceramic meshed plates. Accordingly, the ventilation channels could be duly adjusted depending on a status of heat temperature rises inside the composting chamber, so as to keep a best composting fermentation temperature in the composting chamber.