Reddit mentions of Ventline/Dex VP543 6" 12V Powered Round Vent

I wanted these features:

• reversisble - blow out in the heat and pull in gently in the cold
  
• 10-speed rather than three for finer control and the ability to access a very low speed. Allows for minimal power use and constant use in all seasons for humidity control
  
• thermostat for varying fan speed automagically. I actually don't use this much because it can turn the fan off when it's cool and I want continuous operation
  
• built-in hood so I could run it in the rain without a ginormous doghouse cover on the roof. My van is already 8.5' tall.
  
• remote because my fan and bed are on opposite ends of the 12' living space. I keep it in the console when driving in case I forget to lower it before departure (safe, but noisy).
  
  This led me to the MaxxFan deluxe. It was expensive but completely worth it IMO.
  
  It has a design feature I didn't realize when I bought it. The fan sits down into a mount which is fixed to the roof and sealed. If you need to remove the fan for any reason you can lift it out of the mount and repair/replace/whatever in minutes. This would make repairs or warranty replacement much less of a hassle. I don't know if Fantastic does this or not. Perhaps a FF owner can chime in.
  
  I saved money on this kind of thing by starting camelcamelcamel watchlists on items I knew I'd need for the build. In this example, the fan I bought has varied by $51 dollars in the past year. CCC will alert you when the price drops to a point you specifiy.
  
  I also saved more than $40 on a foam mattress I wanted this way.
  
  Edited to add: I think the Maxx or FF are both excellent fans. Folks in smaller vans could probably do fine with a 3spd manual fan with no cover. There are also marine style mushroom and flat-ish vents with fans in them. There are also wind-powered vents that require no electrons at all. These latter types might fit under solar panels for a neat install.

Hey, good write-up thanks for sharing! I like the comparison chart you did with all the models.

I'd like to give a mention to Ventline fans because no one seems to know about them. They're less "RV" and more "food truck" style, but to someone on a budget, a fan is a fan, right?
Here's the one I have. They can be found as little as $60 shipped on Amazon (I only linked the more expensive one because it had a nicer picture) or $50 shipped on eBay. It's a much smaller fan than the Maxxairs or Fantastic Fans, but definitely worth consideration if you have a smaller space, have a slim power supply (I think it draws 0.5A), or are on a budget (heck, you could install TWO for less than some other brands!) They have other models too, but I think this is the best one of theirs for vandwellers.