David, See below. Gordon, Per our conversations 8” Fire Double Detector Check needs to go outside. Clay, Per our conversation the (2) 6” domestic water backflows can go inside the building. We don’t have the layout of that Fire pump room yet, but, I will draw the domestic water on it as soon as I get it and send it to you. Thanks, Cody Little Plumbing/Fire Protection Design TLC Engineering for Architecture Green Guides Sustainability for Architecture 4131 N. Central Expressway, Suite 200 Dallas, TX 75204 phone: 214-540-5900 fax: 214-540-5940 direct: 214-540-5920 website: www.tlc-engineers.com