Don't see why it wouldn't work. Assuming you power the coil with 12VDC and pass the same 12VDC through the relay to the fan? What is your power supply?
Yes you can use that for fans. It's way overkill, but as long as your fans aren't drawing over 10 A you're set. Are you using a uC to control the relays? If so, you could just use a 2N2222 transistor switch for small PC size fans, or a MOSFET, either of which would be cheaper and have a smaller footprint.
I had that 4 relay board left over from my previous brewtroller build and would like to use it in this new fermtroller build. I'd like to use 2 fans per relay (2 by the freezer part of the mini fridge, and 2 in each fermentation chamber) and the 4th relay would be connected to an SSR for controlling power to the mini fridge.
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