"The ACM2B is designed to provide the thermal resistance range from 1.3 to 0.7°C/W. Each module uses one of OLC's world smallest series crossflow fan to achieve linear air velocity above 800ft/min flow through all fins. ACM2B series, thus, provides "true thermal resistance" to achieve the maximum efficiency of the forced air cooling at lowest profile 30mm. "
FULL STORY @ OLC-INC.COM (http://www.olc-inc.com/ACM2B.html)