I have a few S19j’s coming, and I was looking at this method to reduce noise as well. I may have to rethink this.
I think you're good if you connect hoses directly to intake and outtake + add some good blowers in the tubes and keep the tubes as short as possible. It's not a bad idea to sound-proof the device using a box and hoses, but for +3kW you just need to be a little more sophisticated than with S9s.
The general concept is still fine though.
I would recommend to have a look at this blog post, he has a big power hungry miner as well:
https://www.econoalchemist.com/post/home-mining-for-non-kyc-bitcoin