Reflecting the company's decision to expand international operations, HANSEN TECHNOLOGIES CORP., Burr Ridge, Ill., appointed TAY SECK GUAN as regional sales manager for Asia.

In other Hansen news, JOHN YENCHO was appointed vice president of engineering and business development, and HAROLD STREICHER was promoted to North American sales manager.

FRANK MITCHELL, principal engineer in the regional engineering support organization of AMERICAN ELECTRIC POWER, Columbus, Ohio, and PAUL NELISSEN from HOWDEN COOLING FANS, Oxon, United Kingdom, are the newest board members of Houston-based Cooling Technology Institute .

DANFOSS INC., Baltimore, Md., appointed BRIAN DAVIS vice president, industrial refrigeration, with responsibility for business in North America. Davis has worked in the refrigeration and air-conditioning industry since 1988.

GEA Filtration Div., NIRO INC., Hudson, Wis., added three staff members. BRUCE BLANCHARD joined GEA Filtration as sales manager. BOB KEEFE will concentrate on GEA Filtration's focused growth efforts in neutraceutical, pharmaceutical and biotech market segments. MICHAEL ROBERTS also joined the division as a process engineer. He brings more than five years of operational experience.

ONDEO NALCO, Naperville, Ill., named JACK SHUBERT group vice president and president of Ondeo Nalco's Specialty Div., which includes light manufacturing and commercial industries such as food and beverage, textiles, cosmetics and finishing.