Cold smoking: fan or no fan?

I'm looking to finally pick up a pellet grill after years of wanting one. I have my eye on the Member's Mark 36" from Sam's Club and it looks really solid but there is no ability to run just the fan on its own. I was hoping to be able to do some cold smoking as well with a smoke tube and I was wondering how crucial it is to have a fan on a larger grill like this? Is there an easy fix/substitute that can be used? I've seen some recommend just rigging up an old PC fan or something similar but I wonder how long that will work before all the smoke kills the fan.

Just wondering what creative solutions everyone has come up with or if I should look for a smoker that allows for a fan-only setting.