Here’s an update that’s past due. The ball and keg chiller loop works great on my 7 gallon fastferment. Drilled a hole on the lid to fit the #10 stopper that came with the loop. Drilled the new hole at the location where the airlock hole was previously located in the lid. Running some frozen water bottles in the cooler changed twice a day to keep things at 63F. Once midday and once before heading to bed. If you grab bags of ice even better. This device cools rapidly and keeps temps great. It’s well made. Though I’ve only gone to 63F feel like you could get to lagering temps easy. Especially with a jacket. It would just be a matter of how much maintenance to maintain those temps for a long period of time? That said I’m in Florida so don’t have the benefit of “cool times”. It’s ales or lagers fermented at ale temps for me.
Here’s a pic. Hope this helps since I could not find a lot on the inter webs about modifying a FF with a chiller loop.
Here’s a pic. Hope this helps since I could not find a lot on the inter webs about modifying a FF with a chiller loop.