Friedrich Air Cleaner
A modern look at older Friedrich electrostatic air cleaners: how they worked, maintenance needs, and what to verify today about coverage, ozone and performance.
Friedrich Air Purifier
A modern look at the Friedrich C90B: a particulate-focused electronic purifier with washable plates, strong reported CADR for smoke and pollen, limited odor/VOC removal, and low ongoing filter cost. Verify current specs before purchase.