Its about 10 to 15mm from memory. I might be able to use some spacers to push it out another 5mm maybe. Its all a bit experimental as im quite limited with space. I've seen some blokes have holes cut out and flaps installed on them. Purpose is they open on speed but close when the fans kick in.
I'll find out how it all goes when I get back from holiday. Should only have a day or 2 work left, as long as the parts that came in fit
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