What is a Hot Environment Fan?
Dündar Hot Environment Fans are specially designed centrifugal fans capable of handling temperatures up to 120°C. They are used for ventilating and cooling the existing environment.
Applications of Hot Environment Fans
- Exhausting hot air in areas with high air temperatures.
- Channel applications where axial fans' pressure and flow rates are insufficient.
- Solid-fuel heating boilers.
Fan Body and Impeller
- Features a cooling intermediate impeller that prevents heat transfer from the radial body to the motor, enabling the exhaust of higher-temperature air.
- Constructed with high-quality cold-drawn DKP steel, ensuring a durable radial body.
- Coated with environmentally friendly electrostatic epoxy powder paint, providing high resistance to corrosion.
- Forward-curved radial impeller dynamically balanced to ISO 1940 standards.
- High-pressure and high-flow values achieved with the suction nozzle application.
- Robust and smooth body structure ensured by special clamping body assembly.
- Low noise level for quieter operation.
Motor Specifications
- Manufactured with high-technology CNC machines for precise, contact-free production.
- Motor body features high thermal conductivity aluminum fins.
- Insulation class Class F, allowing for a wide operating range of -40°C to +70°C.
Key Factors in Fan Selection
When selecting a fan, consider the following parameters:
- Required Airflow (m³/h)
- Pressure Losses
- Acceptable Noise Level
- Electrical Power Connection Type
The required air exchange rate for ventilation depends on the purpose of the space, the number of occupants, and the activities conducted within. The table below provides air exchange rate factors for various environments:
| Environment | Air Exchange Rate Factor |
|---|
| Auditoriums | 6-8 |
| Paint Booths | 25-50 |
| Vault Rooms | 3-6 |
| Cinemas and Theaters | 5-8 |
| Commercial Kitchens | 15-30 |
| Foundries | 8-15 |
| Gyms | 4-6 |
| Laundries | 10-20 |
| Indoor Pools | 3-4 |
| Restaurants | 8-12 |
| Conference Rooms | 6-8 |
| Waiting Rooms | 5-10 |
| Photocopy Rooms | 10-15 |
| Machinery Rooms | 10-40 |
| Shops | 4-8 |
| Dry Cleaning | 5-15 |
| General Workshops | 4-8 |
| Hospitals | 8-12 |
| Laboratories | 8-15 |
For activity-based ventilation:
| Activity Type | Airflow per Person (m³/h) |
|---|
| Normal Activity (non-smoking) | 29 |
| Normal Activity (smoking) | 58 |
| Light Activity | 45 |
| Heavy Activity (industrial areas) | 60 |
The required airflow for the environment can be calculated using the following formulas:
Q [m³/h] = Air Exchange Rate (per hour) × Room Volume (m³)
or
Q [m³/h] = Number of People × Airflow per Person (m³/h)
Example Calculation
For an office with 5 occupants, a ceiling height of 2.6 meters, and a floor area of 50 m²:
- Room Volume: 2.6 × 50 = 130 m³
- Air Exchange Rate for offices: 4-8 (assume 5)
- Required Airflow: 130 × 5 = 650 m³/h
- Additional Airflow for occupants: 5 × 29 = 145 m³/h
Total Airflow Requirement: 650 + 145 = 795 m³/h
The fan should be selected based on this airflow requirement.
Additional Considerations
After determining the airflow:
- Identify the fan's installation location (ceiling, wall, duct, or chimney).
- Check the voltage for the fan.
For example:
- For an office, fans are typically wall or window-mounted.
- If standard household electricity is used, a single-phase (monophase) fan is recommended.
- For industrial applications, a three-phase (380V) fan is required.
