But only the largest model, the Z3000, is a true-HEPA machine; the smaller Z1000 and Z2000 are “HEPA-type,” which is to say, not true HEPA. And the company uses 2 air changes per hour to calculate its square-footage ratings, whereas we set 4 ACH as a minimum. TruSens doesn’t list its devices’ CADR ratings publicly,… Continue reading Levoit Core 400S True HEPA 3-Stage Original Replacement Filter, Core 400S-RF White Levoit Philippines