DESC: Fellowes 9270001 AP-230PH Air Purifier, PlasmaTrue Technology, AHAM Certified, Sivler & White Fellowes Air Purifiers have been certified by the Association of Home Appliance Manufacturers (otherwise known as AHAM) with three CADR numbers which indicate the volume of filtered air delivered by the air purifiers. There are three CADR ratings Ð one for smoke, one for pollen and one for dust.