AIRCOL
Radial fans, also known as centrifugal fans, are used to create a pressure difference to move air or other gases. These fans operate by utilizing centrifugal force, which directs air in an outward direction from the center. Similar to a pump, they contain a rotating impeller within a helical housing. Air or gas enters the fan in line with the axis, gets pressurized, and then is directed tangentially through channels around the impeller, exiting through an outlet. Due to the high pressure they generate, centrifugal fans are ideal for high-pressure applications such as drying and HVAC systems. Additionally, their enclosed parts make them suitable for use in air pollution and filtration systems due to particle-reducing properties.
Radial fans are suitable for small and medium-sized spaces, including:
Voltage/Frequency (Volt/Hz) | 230/50 |
Current (A) | 0.13 |
Power (Watt) | 17 |
Airflow (m³/hour) | 160 |
Speed (Rpm) | 2300 |
Pressure (Pa) | 34 |
Noise Level (@3m) (dB (A)) | 33 |
Min/Max Ambient Temperature (ºC) | -30 / 40 |
Weight (Kg) | 0.5 |
Material | ABS plastic |
Protection Class / IP | II / IPX4 |
Motor Insulation Class | B |
When selecting a fan, consider the following four parameters:
The required airflow for ventilation depends on the space's purpose, the number of occupants, items in the room, and their activities. The table below shows the air exchange rates for different environments.
Environment | Air Exchange Rate |
Classrooms | 5-7 |
Libraries | 4-5 |
Residential Kitchens | 15-25 |
Bathrooms | 5-7 |
Residential Toilets | 4-5 |
Public Toilets | 8-15 |
Meeting Rooms | 6-8 |
Offices | 4-8 |
Changing Rooms | 6-8 |
For example, if an office space measures 50 square meters with a ceiling height of 2.6 meters, the total volume would be 130 m³. For an office with an air exchange rate of 5, the required airflow would be 130 x 5 = 650 m³/hour. Assuming five people are working in the office with a normal activity level (requiring 29 m³ per hour per person), the employee air requirement is 5 x 29 = 145 m³/hour. Therefore, the total air requirement for the office is 650 + 145 = 795 m³/hour.
Once you determine the airflow requirement, choose a fan with an appropriate pressure-flow curve, taking into account the mounting location (e.g., wall, ceiling, duct). In offices, fans are typically mounted on walls or windows, and single-phase (monophase) fans are suitable for residential electricity. For industrial settings, a three-phase (380 Volt) fan would be appropriate.