Research Products Corporation, Madison, Wis., makers of "Aprilaire" products, has acquired the "Dri-Steem" humidifier company. Dri-Steem will operate as a subsidiary of Research Products and offer the opportunity for the company to move into commercial and industrial humidification.

Dri-Steem manufactures humidifiers that have been installed in such places as the Mayo Clinic, the Museum of Modern Art in New York City, and the White House.