So first, what is the coverage area size and where can you put the AP? Will the AP have line of sight to the entire coverage area?
Secondly, putting indoor APs in outdoor enclosures is a bad idea for a number of reasons:
* Indoor APs have a much narroer range of permissable temperatures, so it can easily get cold enough that the temperature drops below what the AP can suport and it will fail
* The upper temperature range is also pretty low, so left outside in the summer, the outdoor temp could exceed what the AP supports, and it could get too hot and fail.
* Even if the outside temp stays close to but just below the max temp of the AP, both solar loading (the sun heating the enclosure) and self heating (the AP's own heat acts like a space heater heating up the inside of the enclosure) which then kills the AP.
* Indoor APs mounted outside are NOT covered by the lifetime warranty! The AP-275 mounted outdoors does carry a lifetime warranty.
* Indoor AP's max power ouput is much lower than the outdoor, and will offer 2-6x the range and performance (esp compared to a 205).
* You must use the external antenna version (AP-204) so that the antennas can be placed outside the enclosure.
* By the time you pay for the AP-204, the NEMA enclosure, the bulk head connectors for the ethernet/power and antenna connectors, buy the outdoor rated antennas and jumpers, and then install the entire thing, you will nd up paying the same or more than what an AP-275 would be with it's simple mounting bracket and the ability to connect Cat5/6 right into the AP without the need for all the ancillary parts.