![]() By holding this device infront of the fan you can measure the air velocity. However, if you want to know the CFM of your fan you can simply buy a device called Anemometer aka Wind Meter. The CFM ratings of consumer fans are pre-calculated before production since these are mass-produced. If you are looking for a whole house fan, here is its size guide. ![]() If you are looking for an attic fan here is a size guide. There is a wide range of fan types for a wide range of applications so it is absolutely impossible to know what CFM fan you need without knowing what it is for along with a myriad of other parameters. So it is always important to choose a fan with the right CFM. However, if you install the wrong size fan it may not work as intended, and moreover, it can cause serious damages.įor example, if you buy an over-powered attic fan, it can actually depressurize your attic causing back drafts and even fire hazards. The more the CFM the more air it can move. CFM is a strong indicator of the amount of air a fan can move. First, the CFM requirement for space should be calculated, and the fan should be selected based on this value. If you need a fan you can’t simply go and buy any you like. Couples with an adequately powered motor a long blade can move more air than a shorter one. The longer the blade is, the more air it can move. The length and the shape of the blades also determines its CFM. There are many models with varying blade pitch, for eg: turbines, to facilitate more airflow. This pitch need not remain a constant for the whole length of the fan blade though. The pitch of a fan is the angle between the blade of a fan and the horizontal plane it runs. ![]() However, this increase in CFM with motor power is not linear if all the other measurements of the fan remain the same. This is because a powerful motor can give the fan more RPMs. The CFM rating of a fan depends on three things Ī powerful motor can create more CFM than a weaker motor. However, for some types of fans, like ceiling fans, the CFM ratings at different speeds are also listed. So for what speed is the CFM rated for? The CFM rating shown in the specifications sheet of any fan is of its highest speed, and definitely, this is the highest CFM that this particular fan can produce. ![]() As you know, a fan, whether it is a ceiling fan or an attic fan, has variable speeds. ![]()
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