A humidifier ensures the humidity in your grow room stays at the correct levels. During the vegetative stage, you want a humidity of around 80%. Gradually lower this to 40%  as the grow progresses toward harvest.

Learn all about humidity and your grow room:

More climate related terms:

Climate | Air circulation | Airtight | Charcoal filter | Extractor | Fancontroller | Fans | Hygrometer | Humidistat | Dehumidifier | Heating

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