merl
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Hi, depends upon how handy you are I suppose.
An 80mm fan in our case fitted pretty much perfectly, it helped because the 'tube' tapered slightly too.
Couldn't find a circular 80mm fan so had to grind the corners off of a square one, that meant I had to find an 80mm fan where the lead out wires exited close to the body and not part way up the arm.
I went OTT and chose a fan with a variable speed option and then made a little circuit with a 555 timer IC to give me a half speed option but there simple things that you can purchase if you felt you wanted that option.
Lucky I had a ceiling void where I could furtle the cables behind so no trunking on show.
If you need anything explaining just ask.
An 80mm fan in our case fitted pretty much perfectly, it helped because the 'tube' tapered slightly too.
Couldn't find a circular 80mm fan so had to grind the corners off of a square one, that meant I had to find an 80mm fan where the lead out wires exited close to the body and not part way up the arm.
I went OTT and chose a fan with a variable speed option and then made a little circuit with a 555 timer IC to give me a half speed option but there simple things that you can purchase if you felt you wanted that option.
Lucky I had a ceiling void where I could furtle the cables behind so no trunking on show.
If you need anything explaining just ask.