Sorry, I was thinking backwards when I replied. The fans won't create inverse voltage when free wheeling, they'll create forward voltage. The diodes will allow the voltage through, essentially shorting out the fan. Doesn't matter, the current rating of both diodes is 3 amps. That's what matters in this case not the PIV.
The PIV has to be high enough to withstand the voltage applied to the fan when the relay is on, which is only 12v. With a PIV of 400v those diodes should be good.
Just wanted to clarify that.
70 Chevelle SS396(454), M20, 3.73
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