Home Depot sells hvac venting about one hundred bucks will do three or four units.
I will post photos
Awesome! Curious as well, if it works well I just might order some S7-lite's (if they create less noise/dB) to have at home.
The regular S7 is just too loud to have in an apartment.
You definitely need 2 floors between you and the miner. Mine's in the basement...the back room of the basement and I can hear it all over my first floor, but not on the second floor.
I have my miner rack in the basement... 4 Antminer S2's and 2 Antminer S5's, plus a few Dell servers and whatnot, I do not hear them upstairs except through the intake HVAC ductwork on that leg of the system which is only the kitchen. ( I have the ductwork - 16" x 10" - wide open above the miners to recirculate the heat from the miners throughout the house, therefore it grabs some of the fan noise).
It all depends on the material used in your house. My house was built with quality materials from the late 50's.
I discovered the best sound proofing set-up ever devised about 10 months ago. I get 0 decibels with this system. I have all of my miners hosted at data centers. The fees are less than my electrical costs, there is no heat build-up to deal with, and no matter how hard I try I can't hear a peep out of my S7s! I also have full control just like I did when I ran my S5s in my garage.
https://i.imgur.com/375dHGh.jpg
EDIT: Usually whenever I post things like this I hear a gasp, all heads spin towards me, and then silence. It's like I'm an alien offering a hover car and everyone is thinking "how do I use a hover car on our existing road infrastructure...and he's an alien!"