Matrix Air PR6 Portable Air Cleaner, ideal for home or office, designed for up to 500 square foot area with 9 foot ceilings, variable speed, high performance. Offered by Sol-Air, formerly known as Matrix Air Systems, a division of Pollution Research & Development. Matrix Air/Pollution Research has been manufacturing air filtration and purification since 1983, utilizing "HEPA/CARBON CUSTOM BLEND" filters.