The QuFresh Air Purifier Composite Filter is the second and third filtration step for the QFAP-950 QuFresh air purifier, effectively targeting and removing smoke and odors as well as filtering particles down to 0.3 microns in size with 99.97% efficiency from your indoor space.  This replacement filter is a perfect fit for QuFresh model QFAP-950 and has a HEPA H11 rating along with activated carbon cells for capturing even the smallest common airborne pollutants. Installs easily into the air purifier by simply opening the unit's dual latching drawers. To keep your air purifier operating at peak performance, we recommend replacing your composite filter every 6 months.