A charcoal filter is a metal cylinder filled with active charcoal. This will filter the air going out of your grow room from the strong marijuana smell. A charcoal filter can be connected to the air extractor.

Learn all about climate for growing marijuana:

More climate related terms:

Climate | Air circulation | Airtight | Extractor | Fancontroler | Fans | Hygrometer | Humidistat | Humidifier | Dehumifier | Heating

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