Enclosure for antminers

[Rawbsoup]

I’ll pay for advice

I want to know what I need to do to keep the units cool.

I can house up to 6 Antminers. I have the power all sorted.
I would prob have 2 rows of 3 units high.
I would have a divider and use a 3D printed shell to focus the heat from one side to the other.
I need to know what extractor fan (I’m U.K. based) I would need. Can I put the extractor in the enclosure rather than the wall.

It’s more about temperature but I Wouldn’t mind if we could help reduce the sound