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Comparing Destratification Fans: CFM vs Velocity Profiles

We have been taught that warm air rises and less dense, cold air sinks. This can produce stratification problems in high ceiling spaces. The primary function of a destratification fan is to move air from ceiling to floor and gently mix air temperature layers that form. When selecting destratification products, engineers often use cubic feet per minute (CFM) performance to judge the product’s capacity to achieve destratification. Judging a destratification fan by CFM can be misleading as it does not necessarily indicate how a fan will perform downstream in open air. This is where velocity profiles come in.

What is a Velocity Profile?

Velocity profiles describe the flow pattern and air speeds that can be achieved downstream of the fan discharge.


5000 CFM vs 555 CFM fan

To illustrate this point, compare the real-world air flow visualization of the following two fans:

In the video, a paddle fan that produces over 5000 CFM, which is many times more “performant” than an Airius fan (555 CFM), falls laughably short. This clearly illustrates that a larger CFM value does not necessarily equate to suitability for destratification. The Airius fan, on the other hand, shows a concise column of air thrown to the floor and is why Airius chooses to publish velocity profiles as the main performance indicator for our line of destratification fans. Download cut sheets and velocity profiles

The Airius Difference

Airius’ unique housing design and stator technology do two things; The Venturi nozzle trades a small amount of volume for increased discharge velocity and the stator minimizes the rotational component induced by the fan blades. The combination of these two features produces a fan capable of a long, concise throw pattern for vertical air mixing in tall spaces. When multiple fans work together in unison across a space, destratification is achieved.

What about the Competition?

Even among similar styled fans, our competition falls short:

Just because it looks like an Airius fan, they talk about it like an Airius fan, does not mean it will perform like an Airius fan. Airius builds products that work. Everything else, comes up short.

Talk with one of our Fan Experts today

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