IP69K Cooling Fans NMB Technologies IP69K Cooling Fans are available in a range of sizes with a 12VDC, 24VDC, or 48VDC operating voltage and airflow ranging from 12.36CFM to 346.8CFM. These NMB Technologies fans have the highest extreme environment rating and offer protection against close range, high temperature, and high-pressure spray-downs. Options include a metal casing for even more reliability in high temperatures. The IP69K Cooling Fans operate at a temperature range of -10°C to +70°C. Typical applications include harsh environments, factory automation, food processing industry, refrigeration, LED lighting system cooling, inverters, telecom, and horticulture.