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I'd call Charlie at Griffiths and ask what amperage fuse he would use.
I think i used a 10-15 amp fast fuse when I installed one there.
You can hook up an ammeter in series with the fan at the spade terminal plug in the wire going to the fan, see what it draws when running and use a fast blo fuse that is a little higher than that and carry spares.
When I took the fan off the motor shaft the motor was toast. I loosened the little allen grub screw that locks it onto the shaft and then used needle noze vise grips clamped onto the shaft to keep it from turning while twisting and pulling on the fan to get it off the shaft.
It was stuck on there pretty good but twisted off with some penetrating oil on the shaft.
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