Dezelsky, do you have part numbers and/or the vehicles the VW fans were fitted to please?
If it helps anyone, on my 411 S3 I'm currently running 2 x 12" Citroen BX single pusher fans, as pushers in their original shrouds. It's working fairly well here in the UK, both at idle and at speed.
Better than the originals, certainly, which on my car are 10" Kenlowes and I think may have used heater blower motors. They're in a shroud which appears to cover more of the rad matrix that would be ideal. The BX ones leave the great majority of the matrix clear.
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