| abstract |
The present disclosure generally relates to improved room air cleaners and filter media for use in room air cleaners. In some embodiments, room air cleaners and media exhibit excellent filtration of cigarette smoke and/or formaldehyde. Some embodiments include a multilayer filter medium comprising: a fluorinated electret layer; a sorbent layer adjacent to the fluorinated electret layer; and an optional backing layer, the The optional backing layer has a Gurley stiffness of at least about 200 mg; in the absence of the backing layer, at least one of the fluorinated electret layer, the adsorbent layer, or a combination of two layers has a Gurley stiffness of at least about 200 mg . In some embodiments, the filter media is pleated. |