I got the fan from RS Components here in the UK. RS P/No. 197-4558. Cost = £22.89 (+VAT). It's made by a company called ELINA. Their P/No is HDF-4012L-12LB. Datasheet is attached. I found a company (there are others I'm sure) in the USA here. I'll post pics & other details either tomorrow or Thursday evening. I'm off to bed now. Nighty Night...zzzzz