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#Fan airflow direction how to#

Centrifugal fans normally only blow in the direction of the outlet as shown, while axial fans may be reversible in some cases. The type of fan and its intended useįans generally only come in a few basic designs, most of which are axial or centrifugal types. Of course, if for some reason the fan rotates in the opposite direction (unbeknownst to me) the air would be blown the other way. By looking at the fan and knowing which way the blades are angled, and knowing that it normally turns clockwise, I can see that it will blow air forward. The image above is a great example of a common fan you might run across. Therefore, unless the power polarity is reversed, it will blow air forward. Looking at the fan, we can see the angle of the blades and we know that most of these rotate clockwise (the same direction as a clock). This is a common small fan powered by direct current (DC) and used for many electronics cooling applications.

#Fan airflow direction how to#

Here’s a great example of how to decide which way a fan blows. If the fan’s direction is reversed, the air will go the opposite direction as it would be forced downward (towards the rear) instead of the front. This causes air to blow upwards (to the front of it). In this image you can see exactly what I’m describing: the fan is rotating in the same direction as its blades which are angled downwards. Here’s an animated image I’ve put together to help show this. That’s because a fan always has the same basic design in one form or another: fans use angled and slightly curved blades to cut through the air and force it forward or backward depending on the direction of rotation. These two characteristics of a fan are probably the easiest and most common way to tell which way it blows. Air will blow in the other direction (towards the back). Likewise, if the blade is angled down and the fan turns the opposite direction, the reverse is true. If a blade is angled down and the fan turns in the same direction as the blade angle, it will blow forward. The direction a fan blows air is always determined by (A) the shape of the blades (sometimes called propellers) and (B) the direction they turn.

By the type of fan and its intended useġ.

Using the fan angle and rotation direction.

Here are 3 ways to tell which way a fan blows: It also depends strongly on the fan’s intended use as well. Because of how they work (and how most are designed) there are great clues to help. The great news is that generally speaking it’s easy to tell fan air direction if you know what to look for.

How to tell which way a fan blows – 3 basic methods