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Old 08-29-2010, 04:13 AM
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Default Re: recirculating fan questions

A fan at full speed can be a bit loud, audible anyways, and might disrupt something very quiet, like some frog calls. Turning the speed down a bit turns the volume way down though, and provides a gentler breeze, which is what I think you want. You can do that by placing around a 50ohm resistor in line with each fan, which is also accomplishable with two 100ohm resistors in parallel, and they're super cheap. Or you could just use a 9v power supply, I'd test it with a 9v battery first to see if you're getting the kind of airflow you want.
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