Ive worked on one of these Chris and wondered exactly the same thing. Phone there Tech and got a reply which came in a very cockney accent " Dont know mate, there made in China. We just buy em' in"
Very constructive i thought.
Anyway the reading I had was about 6ohms and it was fine. Massive fan they are!
Assuming it's a mains fan (can't remember what Keston use other than its big, silver and noisy) could you just connect it up direct and see if it runs?
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