[mrob]

HEPA filtration only matters if you have a clean side and a dirty side. Most air filters exhaust clean air into the same room as the intake, so all that matters is clean air delivery rate [0]. It's often possible to get better clean air delivery rate using higher flow through a less restrictive non-HEPA filter.

[0] https://en.wikipedia.org/wiki/Clean_air_delivery_rate

[bsilvereagle]

The removal efficiency of the filter is built in to CADR, so say a MERV-14 filter with higher air flow and a HEPA filter with lower air flow can have the same CADR.

The Wikipedia article does not discuss the 2 (different!) methods of calculating CADR but this does: https://frdmtoplay.com/nagivating-air-purification/