The best replacement for flex fan is clutch fan.

The best alternatives to flex fan are rated as following:
★★★★★  clutch fan
★★★  electric fan
★★  fan clutch
★  clutch
★  stock fan

Your alternative for flex fan is not listed? Suggest!
Speaking about flex fan, one probably shouldn't forget about fan clutch.

Other search terms related to flex fan and their ratings are:
★★★★★ fan clutch
You have in mind a companion for flex fan and it is not yet here? Propose!



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flex fan
clutch fan
electric fan