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You need the Germ Guardian L filter and it says 6-8 months you need to change it, but it is effortless to change. GermGuardian FLT4200 HEPA GENUINE Replacement Filter L for AC4200 Air Purifier
Sorry, there was a problem. Please try again later.You will need the FLT4200 and that will need to be replaced every 6-8 months and cleaned once a month.
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