Patent ID: 6935843

Claim:
A mix flow fan comprising: a) a central hub having: i) an outer rim being a beveled surface; ii) a flat surface located on a first end of the outer rim; and iii) a hollow space located on a second end of the outer rim, the outer rim slopes outwardly from the flat surface to the hollow surface, the flat surface having a diameter that is smaller than a diameter of the hollow surface; b) a plurality of blades equally spaced around an exterior of the bevel surface, each of the plurality of blades having bent surfaces and a bent end connected to the outer rim and extending from the first end of the outer rim to the second end of the outer rim; and c) a plurality of cambered channels formed between adjacent blades of the plurality of blades, wherein an area ratio of air inlet to air outlet is between 1.9 and 2.3.