That's why I was talking about 5-10mm spacing between radiator core and fan - airflow (air under pressure) will find it's way between fan and core...
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On my car I used a Clio rad with a 10" fan mounted 4" behind the rad and a little folded up aluminium shroud to support the fan/duct air.
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I think David was talking about air-duct from radiator to fan... so this can work quite well... but as all aftermarket fans are mounted "on the core" - can't be that bad
