Carbon filters get undersized for auto grows because people assume three small plants cannot produce much smell, and then week six arrives. A single terpene heavy auto in flower can fill a flat, so I match the filter to the tent volume rather than the plant count. The sizing formula, a list of strains known for being loud, and which cheap filters hold up are compared on https://turboautoflowerseeds.com in one place. Negative pressure in the tent matters as much as the filter itself.
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