Welcome! Just some unsolicited suggestions on the dryer ducting... I'm currently testing a setup in that way with (3) Avalon 741 miners, each with a 3d-printed 120mm fan to 4" dryer duct adapter and semi-rigid ducting. After lots of reconfiguration, I have them at stable temps in a 4" => 6" (6x8 wye) => 8" (8x10 wye) => 10" (trunk) running directly to a 10" wall cap to send the hot air right outside. Also helps to reduce some of the fan noise in my "semi-commercial" datacenter room. The most critical tips I can give are (1) put the miners as close to your exit wall as possible to reduce/eliminate any angles, especially 90deg ones, in the ducts. If at all possible, just give them their own exit vent. (2) it's critical (for the Avalon or the S9's) to keep room/inlet temps below about 28-30C and make sure you have fresh air coming in somehow (inlet vent/AC/etc.) because of the negative air pressure (3) give these things plenty of airflow. 10" duct is already pushing the limits of my three miners in terms of restricting airflow.... my HVAC guy was blown away (pun intended) when I told him these "computer fans" can move 250CFM per fan at top speed. A better solution if you have the space would be a hot/cold channel... you could host a lot more miners in that configuration and just have a big fan at the end of the hot channel sending it outside or feeding back into an AC unit. Good luck! Curious to hear what you come up with in the Vegas summer as I'm in the midwest.