Take air filtering to the next level with the Deflecto® Air Filters. These electrostatic filters charged with static electricity reduce airborne particles such as dirt, dust, smoke, pollen and animal hair. They help keep dirt and objects from falling into ducts and they control the spread of pet dander through your HVAC system. Universal 4" x 12" size can be trimmed to fit 4" x 10" registers. Choose Deflecto Air Filters for an enhanced living experience!