I completely disagree. I've never seen an electric fan manufacturer that didn't advise powering up through a relay. You're just asking for trouble. There should always be a relay involved with any high amp draw. It's very easy to hook up, and you still use an ignition hot wire to power it up, but you don't have excessive amps running through the cars wiring. Are you sure you understood their instructions? Who are "they"? What brand and model number fan is it?
Take care,
~Chris
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