Sizing The Exhaust Fan

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How to match extractor fan capacity to tent volume so CBD plants get fresh air without a wind tunnel.

An extractor that changes the tent air every minute or two is the target, and the maths is just tent volume in cubic metres times sixty, with a bit added for the drag of a carbon filter. Undersized fans leave heat and humidity trapped, oversized ones on full blast dry the CBD plants out and make a racket. A calculator that takes tent dimensions and filter type and gives a fan rating is on https://calmcbdseeds.com. Buying a slightly bigger fan with a speed controller covers both mistakes.

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