Hi Brian,
The T310 series APs are IP67-rated, fully ruggedised devices and do not need to be put inside an additional enclosure, unless specifically required e.g. to resist salt-water corrosion in a marine environment or extra cooling/heating in a desert environment.
Please download the data sheet to provide to your installer from here:
https://www.ruckuswireless.com/products/access-points/ruckus-outdoor/ruckus-t310-seriesThe datasheet confirms the device's IP rating and operating temperature range.
Thanks,
Darrel.