Devices that create a pressure difference to enable the flow of air are called fans. The dictionary meaning of “fan” is “cleaner.” Fans blow cold or hot air in a balanced way. They can also be defined as ventilation tools, propellers, propeller blades, or ventilators. Fans are electrically powered devices used to clean the air. A fan has a moving propeller that acts on the air. It gives the fan static and kinetic energy, allowing it to perform its function. Ventilation fans vary according to their application.
They are classified as intake return fans, exhaust fans, and supply fans. Intake fans reduce the pressure of the environment where they operate and are used in systems that mix indoor and outdoor air in HVAC. Intake fans draw air from the environment and are therefore also called aspirators. Exhaust fans work with a mix of indoor and outdoor air. In systems where intake fans are not used, exhaust fans are present. Exhaust fans discharge a smaller amount of return air than the intake air, allowing positive pressure inside. Supply or blowing fans, also called ventilators, are connected to an air duct and create positive pressure in the duct, enabling air movement. These fans also circulate the air in the environment and are therefore also called ventilators.
What does a ventilation fan do?
A ventilation fan is used to remove unwanted dirty, hot, or cold air from a closed space. Air passing through the ventilation duct is replaced with clean air, allowing dirty, hot, or cold air to exit while fresh air enters. Ventilation fans are usually installed at the entrance of the ventilation duct. They are commonly used in places like parking lots, shopping malls, and hospitals.
Types of fans Fans
vary according to their usage. The most common types of ventilation fans include axial fans, centrifugal (squirrel cage) fans, radial fans, hood fans, chimney fans, exhaust fans, bathroom fans, smoke exhaust fans, industrial fans, cabinet fans, blowers, bellows, high-pressure fans, medium-pressure fans, and low-pressure fans. When selecting a fan for an air distribution system, it is important to analyze airflow (air volume) and account for pressure losses in ducts, dampers, louvers, filters, and air washers. Static pressure should be determined. Direct-drive fans are ideal in most cases, and variable flow systems can use frequency inverters if compatible.
Fan maintenance
Periodic maintenance not only extends the life of the device but also ensures more efficient operation. During maintenance, belts should be checked, and fan bearings lubricated if oil levels are low. Dust, dirt, and debris can accumulate on the fan blades due to airflow, affecting both health and performance. Fan blades and filters should be cleaned regularly to maintain efficiency.
GeniO intelligent pump drivers
GeniO intelligent pump drivers are directly mounted on the motor, eliminating the need for an external control panel and reducing cabling, creating a more compact and portable design.
- Power range: 0.75 – 18.5 kW
- Input voltage: 380 V three-phase
- Input frequency: 50-60 Hz
- Output frequency: 0-600 Hz
- Protection class: IP 65
- LCD screen displays real-time pressure, frequency, current, motor speed, output voltage, output power, analog sensor values, and set pressure.
- Easily programmable
- 2 digital inputs and relay outputs
- 2 analog pressure transmitter inputs; one acts as backup if the other fails
Compatible frequency inverter transmitters:
4-13 V working voltage, 0-10 V output
10-30 V working voltage, 4-20 mA output
10 V working voltage, 4-20 mA output
Provides 24 V power for external devices
Set pressure can be easily adjusted
Multiple pumps can communicate via RS 485 using Modbus protocol, allowing up to 6 pumps to operate together
Motor rotation can be changed via software
Emergency mode allows operation at a set frequency without sensors
One frequency inverter with relay output can control two pumps
Programmable display of adjustable parameters
Adjustable acceleration and deceleration times
Error codes displayed on screen
Antifreeze feature
Adjustable max/min operating frequency
Cooling fan can operate automatically or continuously
Password protection prevents unauthorized access
In multi-pump systems, a failed pump is bypassed and backup activates automatically
Protected against high and low pressure
Applications
Intelligent motor-mounted inverters adjust motor frequency to maintain system pressure, saving energy compared to pressure switch systems. They can be used in systems requiring constant pressure, from single pumps to multi-pump systems.