Howdy,
here’s a way to put together a VERY silent extractor fan. Using Noctua or other really high quality computer fans, it’s more silent than EC extractor fans, if one has such stealthy needs.
Can be used in any size LED grow, really. Just needs more computer fans, the more total heat or amount of air there is to move. Computer fans can’t deal with temps above 70-80c however, so not suitable for HID…!! Only for LED and fluorescents etc…
In micro grows, even one fan can be enough; if it’s a quality fan with high static pressure, like all the Noctuas are, then it WILL easily pull through a 1 inch layer of activated carbon pellets, believe it or not. In above 1m2 grows, use 3 or 4 or more 120/140mm fans together…
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Here’s the pictures, if any questions I’ll answer.
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