What is an Axial Fan?
An axial fan is a type of fan where the airflow moves in an axial direction parallel to the shaft, which has blades rotating within it. The flow at both the inlet and outlet is axial. The fan blades draw air in parallel to the axis and push it outward in the same direction. The fan is designed to generate force and create a flow across the fan by creating a pressure difference. Axial fans create a high-flow airflow, which produces a large amount of airflow but at low pressure.
Areas of Use
For small and medium-sized spaces:
It is suitable for ventilation in places such as bathrooms, toilets, kitchens, pantries, laundry rooms, garages, workplaces, etc.
It is specifically designed for use with direct installation or with pipes up to 3 meters in length for connection to the fan.
In bathrooms, for the removal of steamy and moist air, in places where the air is polluted, for the removal of odors and smoke in homes.
Features
- Its aesthetic rear shutter provides the best protection against dust, bad odors, humidity, cold, etc., from entering when the extractor is not in use.
- The fan is designed to automatically stop when the corded rear cover is closed and automatically start when opened.
- The front cover, body, and impeller exposed to dust can be easily cleaned by wiping.
- The optimal motor and body design minimizes the noise level to the lowest level.
- The self-lubricating motor bearings ensure quiet and long-lasting performance.
- Can easily be connected to windows.
- It is protected against water splashes with IPX4 protection.
Usage Options
- The fan can be manually adjusted with a corded cover that performs the on/off function.
- With the time-delayed electronic board, it can be set to work for a desired period after the extractor is turned off and then automatically stop.
- The fan is thermally protected to prevent motor wear in hot environments.
Things to Consider When Choosing an Axial Fan
When selecting a fan, 4 parameters should be considered:- Required airflow
- Pressure losses
- Acceptable noise level
- Electrical power connection type
The required air exchange for the environment to be ventilated is related to the usage purpose of the space, the number of people and items, and activities within the space. The table below shows the required air exchange rates for different environments.
Environment
- Classrooms: 5-7
- Libraries: 4-5
- Home kitchens: 15-25
- Bathrooms: 5-7
- Home toilets: 4-5
- General toilets: 8-15
- Meeting rooms: 6-8
- Offices: 4-8
- Changing rooms: 6-8
The amount of air required per person in living and working areas, depending on activity, helps determine the required airflow.
- Normal Activity (Non-Smoking): 29 m³/hour
- Normal Activity (Smoking): 58 m³/hour
- Light Activity: 45 m³/hour
- Heavy Activity: 60 m³/hour
Airflow Requirement Calculation
Based on the above information, the required airflow can be calculated as follows:Q [m³/hour] = Air change factor (1 hour) * Volume of the space (m³)OrQ [m³/hour] = Number of people * Required airflow per personAfter determining the required airflow in the space, appropriate duct design (taking into account noise and airspeed criteria) should be made, and pressure losses should be calculated. Depending on the environment in which the fan will operate, the type of fan (axial, radial, roof, smoke evacuation, etc.) should be determined, and the fan should be selected according to the appropriate fan curve based on the specified airflow and static pressure combination.
For example, if 5 people are working in an office with a ceiling height of 2.6 meters and a floor area of 50 m², the volume is 130 m³ (2.6 * 50 = 130). For offices, the air change factor is between 4 and 8; we will consider it as 5. Therefore, the required airflow would be 130 * 5 = 650 m³/hour. If the office is operating under normal activity conditions, the required airflow for 5 people would be 5 * 29 = 145 m³. The total airflow required for the office would be 650 + 145 = 795 m³/hour.
Fan selection is made based on this airflow requirement.
Fan Installation Considerations
After calculating the airflow, the installation area of the fan should be determined. Where will the fan be installed? On the ceiling, wall, chimney, or ventilation duct? Another point to consider is the voltage of the electrical supply to the fan. In our example, since we are considering an office, fans are generally installed on walls or windows. If home electricity is to be used, a single-phase fan should be preferred. For industrial applications, a fan operating with three-phase (380 Volt) electricity should be used.