The APS-1000XL is Airocide's newest air purification solution. It was designed for large open spaces in a home. So, it is perfect for basements, bonus rooms, living rooms, hobby shops, and other large spaces. The APS-1000 features Airocide's NASA developed PCO technology, which is perfect for safely eliminating mold spores in the air, odor-causing VOCs, bacteria, and viruses. Additionally, it has a pre-filter for the removal of airborne particulates. The unit is mounted to a wall and comes with the necessary brackets and screws. It is our most powerful consumer air purifier yet, but as with our other products, it has very low maintenance. The activating bulbs are changed approximately once per year (depends on use), and an indicator light will let you know when it is time to make the change. Each maintenance kit includes a pre-filter replacement to help keep your air clear. Of course, we offer our unconditional sixty-day money-back guarantee. So try Airocide for your large space home air purification needs risk free today!