Fantastic fan or Maxxair?

[Ballenxj]

This is in my price range and appears to have the cover.... Am I right?

https://www.amazon.com/Maxxair-00-04000K...tastic+fan

What you linked can't be used in rain.  

The fan I got has the cover integrated.
https://www.amazon.com/gp/aw/d/B002OWAIB8/  

With the fan you linked you also need a cover to have the fan on in the rain  
https://www.amazon.com/gp/aw/d/B000UUMM6K/  

I don't know if the cover I linked will work with the fan you linked.  I didn't check.

 You are correct on all of the above as far as I know, and the cover and vent are both made by the same company (Maxxair) so should work with it just fine. You could always contact Maxxair and ask. When it rains it'll get stuffy inside a closed up van, so in my opinion the vent cover is almost a necessity. 
I just looked them up. Their other company name is AirXcel, and their customer service number is; 316-632-4357. 
http://www.airxcel.com/maxxair/contact-us

[rvpopeye]

This info is a bit dated (2003-2007) but may still apply....

I had both on my class A.(3 speed w/reverse)
The Maxx company made an "empty" cover for other brand fans which I put on my Fantastic .
They both worked well and moved a LOT of air , especially with both running....(1800 cfm is a small tornado coming in through a single window )

The Maxx fan developed a squeak and no response from their cust service after 3 tries .
 A problem with the Fantastic ? , a new part was sent immediately for free by the mfg.
(I heard that Fantastic was sold and cust serv may have changed along with that...probably but not saying it has without checking )
SO , it's a tossup which is better now.

Get one with a cover if you can .  For physical protection as well as a rain cover.
The cover should be designed with enough air flow ability so it doesn't restrict the 900 cubic ft  a minute of airflow these things are capable of. 

 Reverse is the only other feature that I would feel is must have .
(I can show anyone how to wire a DPDT switch to achieve reverse on a fan without that feature ..)