Excellent study looking at the practical implications and durability of performance of portable air cleaners in classrooms in Germany. Several important lessons to be learned https://doi.org/10.1080/02786826.2022.2147414
@cleanairstars Regarding use of multiple air cleaners: a single Noctua NF-A14 5V fan paired with proportionally sized HEPA or MERV-13 filter, should be able to provide ASHRAE's recommended EOAi (for a single person.) A multiple of these, naturally dispersed when powered by [student] phones/laptops facilitates quieter (24.6 dBA), homogeneous air mixing. A 12V power distribution network at ceiling for similar suspended or mounted (fixed) 140mm fan air cleaners follows same principles.
@cleanairstars I have not. (I passed on material to brother who ignored it.) Maybe Rob Wissman tested a HEPA filter once upon a time, but you're about the only link to information since I left Twitter. I'd be curious about MERV-14 as well. Indian fellow I believe (forget name) had posted a study of California school(?) comparing, but may have been in-duct filter. The Noctua NF-A14 iPPC-3000 PWM has a much higher static pressure by comparison.
@WilliamRamsey good to know the breakdown. There will be pressure drop and reduced flow considerations for HEPA filters and PC fans. Have you seen any devices with these fans and HEPA filters measured for performance?