The TCM review of our AF 990 said this regarding the Norcold fridge:
"The only concern about having a refrigerator on a slide this close to the overcab bedroom is the potential for noise from the refrigerator’s ventilation stack. We did not have the opportunity to use the 990’s refrigerator so this may not be an issue."
It is a full-wall slide, but they were talking about proximity to the bed rather than the fact that it's in a slide. It's definitely not an issue for us though. I didn't even realize it had a fan until this weekend. It only runs when it's above about 80F outside, and we don't do much camping where it's warm. The fan noise is very low, and wouldn't bother me even if it did run at night. If it was warm enough at night to require the fridge fan, you would probably need some sort of roof fan or A/C running, which is going to be a lot louder.
2017 Escape 17B, 2012 VW Touareg