Models part FLT420B-01 fits
Air filters load up with dust and smells. The maker lists how often to change it. Find your model number below before you order; the list is sorted by brand.
AC4300GermGuardian air purifierAC4820GermGuardian air purifierAC4825GermGuardian air purifierAC4850PTGermGuardian air purifierAC4870GermGuardian air purifierAC4880GermGuardian air purifierAC4900GermGuardian air purifierAP2200CAGermGuardian air purifierCDAP4500GermGuardian air purifierEach model's page names where its part numbers come from and the date they were checked. Amazon buttons open a search for the part number; we may earn a commission.