| SPAL make some of the best thermofans on the market, their 16" skewed blade fan with sealed (dust and waterproof) motor is probably the pick of the bunch. Give a bit of thought to this though, as no thermofan is going to outflow a functioning OEM clutch fan. Are you going to run a fan shroud? If not this will further reduce efficiency. Oh and wb3ztt there is no way that fan pulls 4000cfm, you have to take manufacturer claims with a grain of salt.
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