I use 4" line for the main exhaust and 3" for the cooling tray. I dont use the Aillio cooling tray adapter. I designed mine to mount the same as the Aillio part. Just thought i would put this out there and see if anyone has interest. I can set it up as a new in my shop if there is interest.
Have you through about using magnets instead of the screws? Asking simply because where i store my Bullet after roasting I won’t be able to have a piece that long attached to the chaff fan. Would need a strong magnet though.
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I think the design would lend itself to that with minor modifications. I would need to do a little research into availabke magnets and see how much holding power they have.