Coleman has expanded its line of indoor air quality products with three new humidifiers: a high-capacity fan-powered humidifier, and small and large bypass humidifiers. Coleman humidifiers provide humidity in the form of pure water vapor to prevent minerals from entering the airstream. Water is supplied to a distribution tray and flows evenly across a water panel. Heat causes the water to evaporate. Properly humidified air is then distributed throughout the entire home. During operation, a constant flushing action occurs, which sends mineral deposits from evaporation to a drain at the bottom of each humidifier. The units include a manual humidistat, saddle valve and a 24-volt step down transformer.

Coleman Heating and Air Conditioning, 5005 York Drive, Norman, OK 73069; (877) 233-0961; www.colemanac.com.