Dundar D 20 Axial Chimney and Wall Aspirator 600 m³ 1425 RPM

What is an Axial Fan?

An axial fan is a type of fan that causes air to flow in an axial direction, parallel to the shaft where the blades rotate. The airflow is axial at both the inlet and outlet. The propellers, which rotate around an axis, draw air in parallel to this axis and push it out in the same direction. The fan is designed to create a pressure difference that generates a flow through the fan. Axial fans produce high airflow rates, resulting in the movement of large volumes of air, though the airflow is at low pressure.

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Where Are Dündar D Series Axial Fans Used?

These fans can be easily mounted in a ventilation opening in your chimney or wall.
Axial fans are widely used in residential and commercial spaces for ventilation purposes. They provide a practical and economical solution for small spaces, ensuring quiet operation.
Due to their ability to create low-pressure, high-volume airflow, axial fans are suitable for general-purpose applications such as:

• Moving air from one location to another
• Cooling
• Ventilating enclosed spaces
• Exhausting hot air in high-temperature areas
• Removing odors and smoke in homes
• Extracting polluted air in offices
• Removing dust, cigarette smoke, and steam
• Cooling industrial machines (e.g., welding machines, transformers, compressors)

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Key Considerations for Axial Fan Selection

When selecting a fan, four main parameters must be considered:

1. Required Airflow Rate
2. Pressure Losses
3. Acceptable Noise Level
4. Electrical Power Connection Type

The required air changes for ventilation depend on the purpose of the space, the number of occupants, their activities, and the contents within the space. Below is a table showing the air change rates for different environments:

Environment	Air Change Rate
Classrooms	5-7
Libraries	4-5
Residential Kitchens	15-25
Bathrooms	5-7
Residential Toilets	4-5
General Toilets	8-15
Meeting Rooms	6-8
Offices	4-8
Dressing Rooms	6-8

The required airflow can also be calculated based on activity levels:

• Normal Activity (Non-Smoking): 29 m³/hour
• Normal Activity (Smoking): 58 m³/hour
• Light Activity: 45 m³/hour
• Heavy Activity: 60 m³/hour

Airflow Calculation Formulae:

1. $Q \, [\text{m³/hour}] = \text{Air Change Rate} \times \text{Room Volume (m³)}$
2. $Q \, [\text{m³/hour}] = \text{Number of People} \times \text{Airflow Needed per Person}$

After determining the required airflow for the space, a suitable duct design (considering noise and airflow speed criteria) should be created, and pressure losses calculated. The fan type (axial, radial, roof-mounted, smoke extraction, etc.) should be chosen based on the environment. Then, the appropriate fan can be selected based on the required airflow-pressure curve.

Example Calculation:

For an office with 5 occupants, a ceiling height of 2.6 meters, and a floor area of 50 m²:

• Room volume = $2.6 \, \times \, 50 = 130 \, \text{m³}$
• Air change rate for offices (from table) = 4-8; take 5 as an average.
• Required airflow = $130 \, \times \, 5 = 650 \, \text{m³/hour}$
• Additional airflow for occupants = $5 \, \times \, 29 = 145 \, \text{m³/hour}$
• Total airflow = $650 + 145 = 795 \, \text{m³/hour}$

Fan selection is then based on this airflow requirement.

Installation Considerations:
Determine where the fan will be installed (e.g., ceiling, wall, chimney, or ventilation duct). Also, consider the electrical voltage for the fan:

• For residential use, choose a single-phase (monophase) fan.
• For industrial use, opt for a three-phase (380 Volt) fan.

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Features of Dündar D Series Axial Fans

• Fan Body and Blade Components:

  • High-quality DKP steel body with aluminum fan blades.
  • Eco-friendly electrostatic epoxy powder coating for corrosion resistance.
  • ISO 1940-certified dynamically tested blades for compliance with standards.
  • Low noise level operation.

• Motor Specifications:

  • High-quality, contactless production using advanced CNC machines.
  • Aluminum-finned motor body with high heat dissipation capacity.
  • Insulation class: Class F, ensuring an operating range of -40°C to +70°C.
  • 230 V / 50 Hz single-phase fan motor.
  • Certified components meeting industry standards.
  • IP44 protection class.

Dündar D 20 Axial Chimney and Wall Fan – Technical Specifications & Dimensions
Technical details and dimensions are provided to match specific installation requirements.