ACM3B series of fan heatsink are designed to provide the thermal resistance range from 0.85°C/W to less than 0.35°C/W. Each module uses one(CFR3B) of serese of world's smallest cross flow fan to achieve linear airflow velocity above 1750ft/min through all fins of heatsink. ACM3B heatsink fan offers "true thermal resistance" to achieve the maximum efficiency of the forced air cooling and the lowest profile from 30mm down to 15mm. They are widely used in low profile and compact thermoelectric(peltier) cooling and electronics cooling.