PollenTec Clean Air Window Screen (21" x 15') ECONOMICAL: Our screens are easy to install and can be done on your own. If you are short on time, a local rescreening company will have no problem replacing your old screens with our clean air window screens. Say goodbye to running the A/C with closed windows and patio doors all spring along with the expensive energy costs associated with staying cool and pollen free. THE SCIENCE: PollenTec is a high tech micron spun polymer screen possessing special triboelectric properties that electrostatically pulls and traps dust and pollen particles on its fibrous grid. The micron grid reduces visibility by 20% and air flow by 30%. Our screens are so effective that they have been tested, approved, and used in hospital clean rooms. ALLERGY CERTIFIED: Our clean air screens have been awarded a formal certification from the European Center for Allergy Research Foundation (ECARF). Our screens are proven to capture up to 98% of airbone pollen allergens and both large and small particles in the air such as household dust, pollen, dust-mite debris, mold spores, and pet dander. In addition, they are flame retardant and self-extinguishing certified (UL & FMVSS302 certifications). MADE IN THE USA: We are proud to announce that we are the only reliable hypoallergenic screen supplier in our Amazon niche to have all stages of manufacturing completed within the United States unlike others who outsource production to China and Mexico. Such decision is resiliently reflected in the build quality and reliability of our window screens and exemplifies our proud support of contributing to American jobs. Tough & durable screens, excellent visibility and air flow, easy to install & maintain