Elmotech

09/10/2026

The same fan can behave differently at different temperatures.

When selecting a fan, airflow and static pressure are usually the first parameters engineers look at. But these values are also affected by the temperature of the air being moved.
As air temperature increases, its density decreases. This changes the relationship between the fan, airflow and pressure — particularly in applications handling heated air.

But temperature affects more than the air itself.

Higher operating temperatures also increase the thermal load on the motor. If a fan is installed inside compact equipment with limited heat dissipation, the actual temperature around the motor can be significantly higher than the ambient room temperature.

This makes the temperature inside the equipment an important selection parameter.

For example, a fan installed in:

- an air handling unit,
- a refrigeration or heat pump system,
- an electrical enclosure,
- industrial cooling equipment,

may operate under very different thermal conditions even if the surrounding room has the same ambient temperature.

So when selecting a fan, it is worth asking not only "What airflow and pressure do we need?", but also "At what temperature will the fan actually operate?"

Because the correct fan selection depends not just on the required airflow — but on the conditions under which that airflow has to be delivered.

25/09/2026

How long should an HVAC fan last?

There’s no single answer.

The service life of a fan depends on much more than the component itself. Operating conditions, load, balancing, motor and bearing characteristics, control strategy, air quality, and system integration all play a role.

For OEM manufacturers, considering these factors early in the equipment design process can make a significant difference to long-term reliability.

In our new article, we take a closer look at what determines the service life of an HVAC fan — and why reliability starts with the design.

👉 Read the full article: https://www.linkedin.com/pulse/what-determines-service-life-hvac-fan-elmotech-group-kmi5f

How long can an HVAC fan operate reliably? There is no single answer. A fan’s service life is determined not only by the quality of its components, but also by how it is selected, installed, controlled, and operated inside the finished equipment.

18/09/2026

What goes into stable and quiet fan operation?

One important step is dynamic impeller balancing.

During the process, the impeller is spun on a specialized balancing machine to identify the magnitude and position of any imbalance. The necessary corrections are then made, and the results are checked again.

Why does it matter?

Even a small imbalance during rotation can cause additional vibration and noise, increase stress on components, and accelerate wear.

Proper balancing helps achieve smoother, quieter, and more stable fan operation.

For OEM manufacturers, fan performance is about more than specifications on paper. It’s also about how reliably the fan performs once integrated into the finished equipment.

11/09/2026

Choosing a ventilation component isn’t just about finding one that matches the required airflow.

Some common mistakes can affect the performance of the entire system.

🔷 Looking at airflow only
Airflow without static pressure doesn’t tell the full story.

🔷 Ignoring installation constraints
Dimensions, mounting, orientation and available space can become critical during integration.

🔷 Choosing based on maximum capacity
The highest-rated component isn’t necessarily the right one. What matters is how it performs at the equipment’s actual operating point.

🔷 Forgetting about noise
A component can meet performance requirements and still create unwanted noise.

🔷 Selecting the fan separately from the system
Filters, heat exchangers, ductwork and controls all affect the final operating conditions.

🔷 Thinking about control too late
If the equipment needs variable airflow, motor and control compatibility should be considered from the beginning.

Good component selection starts with understanding the complete system — not just the datasheet.

07/09/2026

How much does airflow really affect HVAC energy consumption?

When selecting a fan, it’s easy to focus on airflow capacity and motor efficiency. But the actual energy consumption of an HVAC system depends on much more: static pressure, system resistance, operating conditions, and how the fan is controlled.

More airflow doesn’t always mean better performance — and running a fan at full speed isn’t always the most efficient solution.

We’ve looked at the key factors that connect airflow, fan performance, and energy consumption — and what OEM engineers should consider when selecting a fan for HVAC equipment.

👉 Read the full article to see how these factors work together.

When designing HVAC equipment, airflow is one of the first parameters engineers consider. But airflow does not exist independently from energy consumption.

26/08/2026

An air curtain may look like a simple piece of HVAC equipment, but its performance depends heavily on the airflow system inside.

The fan needs to deliver a continuous air stream across the full width of the outlet while fitting into a relatively compact housing. This makes fan selection an important part of the overall air curtain design.

Crossflow blowers are often used for this type of application because their long tangential impeller can generate airflow along the entire length of the outlet. Their compact geometry also allows them to be integrated into slim equipment designs.

For OEM engineers, the fan selection comes down to more than airflow capacity. Key factors include:

• Airflow and pressure requirements
• Outlet width and air distribution
• Available installation space
• Noise levels
• Motor efficiency
• Control requirements

The fan may be only one component inside an air curtain, but its characteristics directly influence how the finished system performs.

19/08/2026

Axial vs. Centrifugal Fans: Which One Is Right for Your Application?

🔷 Axial fans are designed to move large volumes of air in the same direction as the fan axis. They are typically selected for applications with low system resistance where high airflow and compact design are the primary priorities.

Common applications include:

Condensers
Evaporators
Heat pumps
Air-cooled heat exchangers
General ventilation

🔷 Centrifugal fans, on the other hand, draw air into the center of the impeller and discharge it at a 90-degree angle. Their design allows them to generate higher static pressure, making them suitable for systems with ducts, filters, or heat exchangers that create greater airflow resistance.

Typical applications include:

Air handling units (AHUs)
Ventilation systems
Industrial HVAC equipment
Dust extraction systems
Air filtration units

Rather than asking which fan is better, the more important question is which fan technology best matches the operating conditions and performance requirements of your equipment.

07/08/2026

Choosing the right airflow component is about more than comparing technical specifications. It's also about selecting the fan technology that best matches your application's requirements.

Crossflow blowers are designed to deliver a wide, uniform airflow across the entire length of the impeller.. Their compact design, quiet operation , and even air distribution make them an excellent choice for applications where airflow consistency is essential.

Typical applications include:

✔️ Floor convectors
✔️ Refrigerated display cabinets
✔️ Air curtains
✔️ Fireplaces and pellet stoves
✔️ Fan coils
✔️ Home and commercial appliances

Each of these applications benefits from the same core advantage: a smooth, consistent airflow across a long outlet, where traditional axial or centrifugal fans may not provide the desired air distribution.