The Flexxaire Fan System is an elegant refinement of the variable pitch fan. Combining these three which would be the most efficient fan … It is commonly stated that "the steeper the blade pitch, the more air a fan will move" or "a good fan will have a blade pitch of 14 degrees or more". There are three main factors for a good fan: one is speed at which air is circulated; second,the volume of air it can circulate; and the third is providing maximum work for minimum power. Rather than focusing on varying the pitch of the blades, Flexxaire has created a variable pitch engine cooling fan system that understands when and how the pitch should change to maximize your engine’s performance. And for example, on 325mm blades with the blades seperated to 112.87mm at the tip the single blade pitch is 10 deg. Tear off a small piece of adhesive tape approximately 2 inches long and write "1" on it with your permanent marker. The distance you hang your fan from your ceiling impacts how much air it can move. Higher pitches move more air throughout the room, but the motor’s speed and design, blade design, length, and material all impact how effective it is as a whole. What could be the most efficient fan blade design? The optimal blade pitch for a ceiling fan is 12-15 degrees. The fan is running at 1,200 rpm. Measure the degree of pitch on the fan blade. This fan is the perfect solution for either indoor or outdoor use. The angle of the blade makes a difference in how much air a fan can circulate throughout a room. This means that each revolution of the running fan blows the one-foot-diameter column of air coming through the fan 8 inches toward you after accounting for efficiency losses. Emerson’s Crown and Premium fans have a 12 degree pitch, but because their motor is so strong, still move air comparable to steeper pitched fans—if not better. In this example, a small household fan on a stand has a three-bladed plastic fan with a 1-foot diameter and an 8-inch effective pitch. This is a cost-effective fan with a bronze texture and quality built oak blades. Flushmounted, or hugger, fans are significantly less effective at cooling rooms. Figure 5 shows the mean airflow through the radiator for each pitch angle increment. It doesn’t matter if the location is dry or humid, the fan will operate flawlessly in any situation. Write the degree on a piece of paper. Place the tape on the edge of the fan blades to mark which ones you have already measured. For some ceiling fan models, higher pitch does not mean more savings, especially if the unit has a lower-efficiency motor installed. We set the distance and blade-tip clearance at the optimal values. Blade pitch is the angle, measured in degrees, between a 180-degree horizontal plane and a ceiling fan's blade tilt. 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