For over 70 years, Addison has been providing the best in fresh air solutions to make a safer, healthier, and more productive indoor environment. With over eight generations of Dedicated Outdoor Air (DOAS) products, Addison continues to lead the industry in product development. From its highly configurable PR Series, modular split MA/MC series, and the all new compact AK Series, Addison offers ultimate performance configured for customer applications. The Addison name has become synonymous with innovative design, quality manufacturing and dependable service. It’s what they call The Addison Advantage.