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Central heat / AC systems don't work for this. These typically use MERV-rated filters. These are significantly less effective at removing small particles than HEPA-rated filters (the best MERV rating, MERV-16, merely removes 75% of particles.
https://www.microcovid.org/blog/hepafilters currently says:
MERV-16 is rated at 95%, not 75%: https://www.nafahq.org/understanding-merv-nafa-users-guide-to-ansi-ashrae-52-2/ Maybe you were thinking of MERV-14's performance in the 0.3-1 micron range?
Even then, doesn't it depend on airflow? A lower-filtration option should outperform a higher-filtration one if the flow difference is large enough.
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