u dont need to buy the fan shrouds. I made them a while back but found that they werent needed. if u want the best cooling u have to first tell folks if u have a drop ceiling or are you trying to run duct to some cobbled together window setup. if its the former u will want to mount the miners on legs so they are vertical not horizontal. you can then run ducts up to the drop ceiling panels and cut holes slightly smaller than the duct tubing so it stays snugly in place. 6in or larger and stretch it out completely so there are no rippled and pull it over the exhaust fan of the miner. if its the later then regular ol duct work isnt somethin i would recommend unless you have something on the other end also pulling the air through the tubing. I havent ever been able to get any benefit from running duct work to a window or whatever. the only temp lowering solution i have found to work is running it into a drop ceiling. just running duct tubing horizontally will do more harm than good usually.

All my s9's are vertical with duct running up into the ceiling btw...this isnt me speculating. I also have a huge ass exhaust system pumpin the air from the miners into the building chiller but it has been done in none commercial environments too.