Thor, or should that be Zeus?

[Desertboy]

Thanks. Certainly an option.

I like this too, not sure how adequate it would be on a 4KW Spindle.

https://www.youtube.com/watch?v=2OZCviK0msg

I would worry that's underpowered but I also read you don't need a lot as the spindle are pretty efficient and don't make much waste heat. I'm going to use a 2.2kw spindle for maybe up to 10 hours per day 5 days a week I'm hoping a 200l barrel will be enough on it's own but if need be I'll use one of those heat exchangers I linked to I can get them much cheaper than that link from scrap yard friend so if you ever want one just PM me and I'll sort it out.

I'm only going to use a maxijet pump (Aquarium style) but it'll be fine as long as the head height is enough (Which it is 2m's) but will need to reduce it for the spindle (13mm standard hose pipe on pump)

The heat exchangers are 25mm pipe compatible

These fans are pretty quiet and pump a lot of air also cheap!
http://www.ebay.co.uk/itm/4-5-6-Bath.../261741641853?

Just drill some holes in the fan casing and cable tie it to the radiator it's probably best the blow through the radiator but even if you suck I bet it would work great.

You can fit 2 5" on the heat exchangers but 1 6" would be fine on it's own.