For air filtering, you want big fans that move relatively slowly. At least, at lower settings.

I still haven’t seen anything else that can compare to IQAir HyperHEPA filters. They use these things in hospitals.

IQAir HyperHEPA is substantially worse than the AirFanta 3Pro. The 3Pro gives you about 10x more clean air per dollar (2 CFM/$ vs 0.2 CFM/$), and 2.5x more clean air at a given noise level (45dBA: 213 vs 86 CFM).

I agree big fans moving slowly is better all else equal, and something AirFanta-like that used a 12" fan could be even better.

All my air filters are sized to clean air while being quiet.

Turning them up to med/high would just cause too much airflow.