The present scent distributor is a cartridge for attaching to a permeable substrate such as an air filter or humidifier pad. The cartridge housing is configured to hold the scenting media, said housing including a body and a cover a plurality of openings in said housing to allow air to flow through at least a portion of said housing for interaction with the scenting media a restrictor that slidingly engages with said housing to selectively restrict the flow of air through said housing and an attachment device on said housing to attach said housing to a porous substrate.
