The air purification option is designed for rare collections of libraries and museums, plus occupants of hospitals, schools, natatoriums, and other commercial buildings that need dehumidified outside air, but are sensitive to outdoor and recirculated indoor air odor and gaseous contaminants, says the company.

The air purification option is available on all DRY-O-TRON units ranging from 1,000 to 50,000 cfm.