I did a bit of experimentation with different filters for a DIY build like that.
Setup: I tried out a bunch of different air filters in a medium-sized apartment. Two objectives: how fast PM2.5 is removed, and down to what level can it bring down PM2.5.
From worst to best:
* Nordic Pure 20x20x4M15+C MERV 15 - the carbon layer absolutely kills airflow, doesn't work
* Filtrete 20x20x1, AC Furnace Air Filter, MPR 2800 / MERV 14 - works okay
* Nordic Pure 20x20x4 - works well
* Lennox Corporation X7935 20X20X5 MERV 16 - works the best. This thing is an absolute beast in terms of filtration performance; significantly lower steady-state PM2.5 readings during the California fires.
Setup: I tried out a bunch of different air filters in a medium-sized apartment. Two objectives: how fast PM2.5 is removed, and down to what level can it bring down PM2.5.
From worst to best:
* Nordic Pure 20x20x4M15+C MERV 15 - the carbon layer absolutely kills airflow, doesn't work
* Filtrete 20x20x1, AC Furnace Air Filter, MPR 2800 / MERV 14 - works okay
* Nordic Pure 20x20x4 - works well
* Lennox Corporation X7935 20X20X5 MERV 16 - works the best. This thing is an absolute beast in terms of filtration performance; significantly lower steady-state PM2.5 readings during the California fires.
Test equipment: Awair and Plume Flow v2.