Im sure after a few run with it you'll have it worked out.I can only really brew with the garage door open due to the rain that would fall inside the garage and soak everything because of the steam from the boil. Well that is until now - I hope.
I fitted a 45cm high frame at ground level between the garage door sides and installed a turbo (manufacturers description) in-line fan at one end. The fan is connected to a plastic bell-end (no not me!) that is suspended over the kettle using the coiled plastic ducting.
The bell is supported above the kettle top with spacers to allow air to be sucked in and, hopefully, carry the steam away down the ducting by the fan. The frame at the door allows me to shut the garage door down to the same level and stop any howling wind that I usually get battering the garage doorway - especially when I want to brew when the weather is crap.
Well that is the plan anyway. Test runs suggest it does work but because the bell is so thin there may be more condensation created than the fan can carry away. I could reduce the ducting length and insulate the bell to avoid that... I'll wait and see...
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Looks good