Using up my 5 last 3M Filtrete Elite Allergen MERV-13 filters before the start of the haze season proper. Usually this would be usable for around 4-6 weeks before it goes down, coz it's electrostatic.
Also have 1 more set of Honeywell H13 filter to use in the Sharp KC-840. And 3 more TB HEPA 45mm. And 2 more Sharp H13 originals. I think i over did it.
Tested the particle efficiency. It's 90% but at my Sharp KC-840's medium high speed.
High speed, it's unable to hold on to 90% but drops to about 75%.
However, airflow rises in high speed, of coz.
It's a 1" 25mm thick filter, and not so many pleats vs TB HEPA. Compared to 45mm TB HEPA, the airflow increased about 22%. So yes, this has pretty low resistance but very decent filtration, despite being 25mm and only having 50% of the pleats that the HEPA has.
Lousy cutting though.
But that's ok, i have the M8088A in the room as well.