oxer Video howto https://www.youtube.com/watch?v=KL9Te_hSiOA
8-port PoE midspan injector http://www.amazon.com/WS-POE-8-48v60w-passive-Ethernet-Injector-cameras/dp/B0086SQDMM/ref=sr_1_3?ie=UTF8&qid=1417751427&sr=8-3&keywords=power+over+ethernet
cheap PoE splitter http://www.amazon.com/Power-Ethernet-Injector-Splitter-Cable/dp/B00APVQYA4/ref=sr_1_6?ie=UTF8&qid=1417754731&sr=8-6&keywords=poe+splitter
8" Duct dampener http://www.amazon.com/8-Inch-Diameter-Normally-Electronic-Damper/dp/B0026GPDU8
5 port ethernet switch http://www.amazon.com/TP-LINK-TL-SF1005D-5-port-100Mbps-Desktop/dp/B000FNFSPY/ref=sr_1_1?ie=UTF8&qid=1417753108&sr=8-1&keywords=ethernet+hub