DIY folks are not a commercial outfit with access to testing equipment.

Having said that, there are reviews of some DIY models reviewing CADR[1], and it's bizarre to complain about testing decibles since Arctic P14 fans, the most commonly recommended fans, are a thouroughly tested product. Running them at around 25% based on lower PM2.5 readings is almost inaudible from experience.

[1] https://www.youtube.com/watch?v=ZjGJN57DgA8