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Dündar K 25 Shuttered Axial Exhaust Fan, 800 m³, 1,375 RPM

$71.77 $99.69 · In stock

Brand: Dündar · SKU: 102254100 · Warranty: 24 months

Dündar K 25 Shuttered Axial Exhaust Fan, 800 m³, 1,375 RPM

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Product description

Dündar K 25 Shuttered Axial Exhaust Fan Specifications


MODEL ØA B ØC ØD E F
K-25 240 300 320 230 120 85

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 on which the blades rotate. The flow is axial at both inlet and outlet. The blades rotating around an axis draw air parallel to that axis and push it outward in the same direction. The fan is designed to generate force by creating a pressure difference, causing flow through the fan. Axial fans produce airflow with a high flow rate, generating large volumes of airflow. However, the airflow they produce is at low pressure.

Where Are Dündar K Series Axial Fans Used?

  • Axial fans are widely used for ventilation in residential and commercial spaces.
  • These fans offer a practical solution for the ventilation needs of small areas and operate quietly.
  • Thanks to the rear shutter, when the fan is not in use the indoor space is isolated from the outside, preventing unwanted elements such as dust and cold air from entering.
  • Hot air extraction in areas with high air temperatures, removal of odors and smoke from homes,
  • Stale air extraction in offices,
  • Environments with dust and vapor,
  • In areas of homes where airflow is insufficient,
  • In classrooms,
  • In smoking environments,

Dündar K Series Axial Fan Casing and Impeller Components

  • Casing made from cold-rolled high-quality DKP sheet steel and aluminum impeller blades,
  • High corrosion resistance through environmentally friendly electrostatic epoxy powder coating,
  • Impeller blades dynamically tested to ISO 1940 standard,
  • Low Noise Level

Dündar K Series Axial Fan Motor

  • Quality production without manual handling on high-technology CNC machines,
  • Aluminum-finned motor housing with high thermal conductivity,
  • Insulation Class F for a wide operating range of −40° to +70° for the windings,** 230 V / 50 Hz single-phase fan motor,***
  • Standards-compliant certified components,
  • IP 44 protection class,

Dündar K Series Axial Fan Casing and Impeller Components

  • Casing and impeller blades made from alloyed aluminum disc; high corrosion resistance through environmentally friendly electrostatic epoxy powder coating,
  • Impeller blades dynamically tested to ISO 1940 standard; front and rear protective guards compliant with EN 60335-2-80,
  • Low Noise Level

Things to Consider When Selecting an Axial Fan

4 parameters should be considered when selecting a fan:
  • Required Air Flow Rate
  • Pressure Losses
  • Acceptable Noise Level
  • Electrical Power Connection Type
The air changes required for the space to be ventilated depend on the intended use of the space, the number of occupants and objects inside, and their activities. The table alongside provides the required air change rate coefficients for different environments.
ENVIRONMENT AIR CHANGE RATE COEFFICIENT
Classrooms 5-7
Libraries 4-5
Domestic kitchens 15-25
Bathrooms 5-7
Domestic restrooms 4-5
Public restrooms 8-15
Conference rooms 6-8
Offices 4-8
Changing rooms 6-8

The amount of air per person in living and working spaces, depending on activity, can help determine the required air flow rate.


Normal Activity (Non-Smoking) 29 m³/h
Normal Activity (Smoking) 58 m³/h
Light Activity 45 m³/h
Heavy Activity 60 m³/h

Based on the information provided above, the required air flow rate is determined as follows.

    • Q [ m³/h ] = Air change rate coefficient (1 hour) × Space volume (m³)

Or

  • Q [ m³/h ] = Number of people × Air flow rate required per person
After calculating the required air flow rate, an appropriate duct design (taking into account noise and air velocity criteria) must be made and pressure losses must be calculated. Depending on the environment in which the fan will operate, the fan type (axial, radial, roof, smoke exhaust, etc.) should be decided upon, and the correct fan should be selected from the appropriate fan curve based on the determined flow rate–static pressure pair. To illustrate briefly with an example: an office with 5 employees has a ceiling height of 2.6 m and a floor area of 50 m², giving a volume of 2.6 × 50 = 130 m³. The air change rate given in the table for offices was 4–8; taking an average of 5, the requirement is 130 × 5 = 650 m³/h. Assuming normal activity levels, 5 people × 29 m³ = 145 m³ of air is needed for the occupants, giving a total air requirement of 650 + 145 = 795 m³/h.

Fan selection is also made based on this flow rate requirement.

After completing the flow rate calculations, the installation location of the fan must be determined. Where will the fan be mounted — on the ceiling, wall, chimney or ventilation duct? Another consideration is the voltage of the electrical supply to the fan. Since we are using an office as our example, let's continue from there. Fans are generally mounted on walls or windows in offices. If domestic electricity is to be used, a single-phase fan should be preferred. If the fan is to be used in an industrial setting, a fan operating on three-phase (380 V) power should be used.

Technical Specifications & Dimensions

Specifications

BrandDündar

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