I am also working on a very large extremely quiet air filtration appliance, using an extremely quiet quite big fan (500 mm blade diameter, 520 mm square frame) I have designed, and continue to improve.  This is the google folder for cad files etc, related things such as the SDP810-125A based micromanometer code are also here: 

https://drive.google.com/drive/folders/12mkNoaHBySbqeCwcTWhB2y3quVBViPBS?usp=sharing

Big quiet filter box, which uses the big quiet fan and a set of filters and mechanical structure to form an air filtration appliance with higher performance by far than the nearest equivalent available on the market: 

https://docs.google.com/document/d/1jMqLlYyqZIlxS1OECqng-gznYJxwWXS-mYVez3LJJ2U/edit?tab=t.0

UVC Nukit torch mod for external power/constant operation:

https://docs.google.com/document/d/1BQh_6jLaWd9nHVWsMZghqf-FgCTMaG_XzB_kwg550y4/edit?tab=t.0