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  •   Transition | adapter | duct connector (elbow) 90° | for ventilation systems | for connecting round and rectangular ducts | D150 | 204x60mm | 620JO15A
      Transition | adapter | duct connector (elbow) 90° | for ventilation systems | for connecting round and rectangular ducts | D150 | 204x60mm | 620JO15A 1
      Transition | adapter | duct connector (elbow) 90° | for ventilation systems | for connecting round and rectangular ducts | D150 | 204x60mm | 620JO15A 2

    Transition | adapter | duct connector (elbow) 90° | for ventilation systems | for connecting round and rectangular ducts | D150 | 204x60mm | 620JO15A

    Code: 01516
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    Duct transition / adapter 90°, designed for ventilation systems to connect a round D150 mm duct with a rectangular / flat 204x60 mm duct. This is a practical plastic elbow that allows changing the duct direction at a 90° angle and transitioning from a round connection to a rectangular one. The adapter is suitable for ventilation systems in residential, commercial, and technical premises where compact connection of different types of ducts is required.
  • Product description

    Duct transition / adapter 90° – D150 to 204x60 mm, plastic elbow for ventilation systems

    Duct transition / adapter 90°, designed for ventilation systems to connect a round D150 mm duct to a rectangular / flat 204x60 mm duct. This is a practical plastic elbow that allows you to change the duct direction by 90° and transition from a round connection to a rectangular one. The adapter is suitable for ventilation systems in residential, commercial, and technical spaces where compact connection of different duct types is required.

    Main idea:
    This 90° elbow is used when you need to connect a round D150 mm duct with a flat 204x60 mm duct while simultaneously changing the airflow direction. It is a convenient solution for areas where a round duct must transition into a flat one due to limited installation space, wall, ceiling, or equipment layout.
    Angle
    90°
    Round connection
    D150 mm
    Flat connection
    204x60 mm
    Material
    Plastic

    Operating principle

    The adapter acts as a connecting duct piece between two channels of different shapes. One side is designed for a round D150 mm duct, and the other for a rectangular / flat 204x60 mm duct. The 90° angle shape allows for changing the airflow direction and adapting the duct path to the specific installation site.

    Such a solution is frequently used in kitchen hood, bathroom ventilation, recuperation, air exhaust, or air supply systems when a round duct must be connected to a flat channel or when the duct height needs to be reduced due to space constraints.

    What is the benefit of transitioning from round to flat ducts?
    A flat 204x60 mm duct is convenient for installation where there is little space for height – above cabinets, near ceilings, in wall niches, or in narrower technical zones. A round D150 mm duct is often used as a standard connection for fans, range hoods, or air exhaust equipment, making this adapter an essential tool for integrating both systems into one path.

    Technical parameters

    Product type Duct transition / adapter / connector
    Piece shape Elbow 90°
    Purpose Connecting round and rectangular / flat ducts at a 90° angle
    Model / code 620JO15A
    Round duct mounting diameter D150 mm
    External diameter 150 mm
    Rectangular / flat duct mounting dimensions 204x60 mm
    Height 193 mm
    Width 204 mm
    Material Plastic
    Color White
    Area of application Ventilation, exhaust, and air supply systems
    Suitable for use with D150 mm round ducts and 204x60 mm flat ducts

    Where is it used?

    • In kitchen range hood systems – for connecting a round D150 outlet to a flat 204x60 mm duct.
    • In bathroom and WC ventilation – when you need to change the duct direction and transition to a different duct shape.
    • In recuperation systems – according to the specific air supply or exhaust path.
    • In technical rooms – when ducts need to be routed near ceilings, walls, or in limited installation zones.
    • In residential and commercial premises – for installing air exhaust or air supply systems.

    Practical installation example

    For example, in a kitchen, the range hood outlet is round D150 mm, but the duct needs to be routed above cabinets in a narrower flat path. In this case, this adapter allows you to connect the round hood outlet with the 204x60 mm flat duct and immediately change the airflow direction by 90°.

    During installation, it is important to ensure an airtight connection so that the airflow does not lose efficiency and the joints do not cause vibration, noise, or air leakage. If necessary, appropriate sealing agents, fasteners, or duct connectors are used.

    Pros

    • 2 functions in one piece – transition from round to flat duct and a 90° elbow.
    • D150 mm round connection – matches frequently used diameters for ventilation, range hoods, or exhaust.
    • 204x60 mm flat connection – convenient for installation in areas with limited height.
    • Plastic construction – lightweight, easy to install, and suitable for many residential ventilation solutions.
    • White color – neutral look, easier to match with light-colored surfaces.
    • Suitable for changing direction – allows turning the duct path by 90°.
    • Practical solution for range hoods – when a round outlet needs to be connected to a flat duct.

    Cons / limitations

    • Suitable only for specific dimensions – D150 mm and 204x60 mm duct systems.
    • 90° angle can increase air resistance – fan or range hood performance must be considered.
    • Requires an airtight connection – improper connection can lead to air leakage or noise.
    • Plastic is more sensitive to heat – cannot be used where temperatures exceed the manufacturer's permitted limits.
    • Not suitable for chimneys – this part is intended for ventilation systems, not for smoke or high-temperature removal.

    Safety and installation notes

    The adapter is a connecting piece for a ventilation system, so during installation, it is necessary to consider the airflow direction, duct dimensions, fan or range hood performance, connection airtightness, and specific operating conditions.

    • Use only with compatible ducts – the round connection is designed for D150 mm, the flat connection for 204x60 mm ducts.
    • Ensure airtightness – connections must be firmly secured, and sealed with appropriate materials if necessary.
    • Do not apply mechanical loads – the duct part should not bear structural loads.
    • Do not use for smoke or high-temperature removal – the plastic part is designed for ventilation systems.
    • Consider air resistance – 90° angles and transitions can reduce airflow efficiency if the system is not designed correctly.

    Quick selection guide

    Transition / adapter 90° D150 to 204x60 mm – a suitable choice when you need to connect a round and a flat duct and change the airflow direction by 90°. This part is especially useful in range hood, ventilation, and air exhaust systems where, due to limited space, a round duct transitions into a flat path.

    Angle
    90°
    Round connection
    D150 mm
    Flat connection
    204x60 mm
    Material
    Plastic
    Suitable when you need to:
    • connect a D150 mm round duct with a 204x60 mm flat duct;
    • change the duct direction by 90°;
    • install a duct in a space with limited height;
    • connect a range hood to a flat ventilation path;
    • install an air exhaust or air supply system in residential or technical rooms.
    Check before installation:
    • if the round duct diameter is D150 mm;
    • if the flat duct dimensions are 204x60 mm;
    • if there is enough 193 mm clearance in the installation area;
    • if the 90° angle will not hinder airflow according to system performance;
    • if connections will be properly sealed and fastened.
    Important reminder:
    This plastic part is intended for ventilation and air circulation systems. It must not be used for chimneys, high-temperature air removal, or systems requiring special fire-resistant properties.

    FAQ – frequently asked questions

    What is this adapter for?
    It is designed to connect a round D150 mm duct with a flat / rectangular 204x60 mm duct and change the duct direction by 90°.
    What is the diameter of the round connection?
    The mounting and external diameter of the round connection is 150 mm.
    Which flat ducts is it suitable for?
    The adapter is intended for a 204x60 mm flat / rectangular duct.
    What material is the part made of?
    The part is made of plastic.
    Can it be used for a range hood?
    Yes, the adapter can be used in the ventilation path of a range hood if the hood outlet and duct dimensions match the D150 and 204x60 mm connections.
    Does the 90° angle affect airflow?
    Yes, every 90° bend can increase air resistance, so it is important to assess the overall duct path and the performance of the fan or range hood.
    Can it be used for a chimney?
    No. This is a plastic ventilation piece intended for ventilation systems, not for smoke or high-temperature air removal.

    Practical transition from a round duct to a flat ventilation path

    The 90° transition / adapter D150 to 204x60 mm helps conveniently connect ducts of different shapes and adapt the ventilation path to the actual installation site.

    Due to its plastic construction, white color, D150 round connection, and 204x60 mm flat duct interface, this part is a practical solution for range hood, ventilation, air exhaust, and air supply systems.

    Illustrative image may have been created using AI. The appearance of the product may differ slightly from the image shown. Please refer to the technical specification.

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