In traditional cooler design, the center of the heat sink won't have any air flow due to the fan hub resists air turbulence. Therefore the air won't be helpful the heat transfer to the heat sink center . With DuctingMod, air can be blow into the fan ducting and spread the cool air to the heat sink. By eliminating the air turbulence, we not only achieve a better cooling capability, but also decreased the noise level associated with it.