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  •   End cap for air duct | ventilation system | D400 | galvanized steel | silver | 400GDO
      End cap for air duct | ventilation system | D400 | galvanized steel | silver | 400GDO 1
      End cap for air duct | ventilation system | D400 | galvanized steel | silver | 400GDO 2
      End cap for air duct | ventilation system | D400 | galvanized steel | silver | 400GDO 3

    End cap for air duct | ventilation system | D400 | galvanized steel | silver | 400GDO

    Code: 03726
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    End cap for D400 duct, designed for sealing the ends of round ventilation ducts when it is necessary to neatly finish a duct section and protect the system from unwanted air movement, dust, or the entry of foreign objects. The cap is made of galvanized steel, has a silver color, and is adapted for ducts with a mounting diameter of 400 mm.
  • Product description

    End cap for D400 duct – galvanized steel, silver, for ventilation systems, 400GDO

    End cap for D400 duct, designed for sealing the ends of round ventilation ducts when it is necessary to neatly finish a duct section, and to protect the system from unwanted air movement, dust, or the entry of foreign objects. The cap is made of galvanized steel, features a silver color, and is adapted for ducts with a 400 mm mounting diameter.

    Main idea:
    This end cap is used for sealing the end of a D400 ventilation duct. It helps to neatly finish a ventilation system line, cover an unused duct end, or temporarily/permanently isolate a duct branch according to a specific system schematic.
    Diameter
    D400 / 400 mm
    Material
    Galvanized steel
    Purpose
    Closing a duct end
    Color
    Silver

    Operating principle

    The end cap is installed onto the end of a round ventilation duct when the opening needs to be sealed. It can be used at the end of a system, for closing an unused branch, or as a technical finishing element in ventilation and air supply/exhaust systems.

    The galvanized steel construction provides mechanical strength and corrosion resistance under standard operating conditions for ventilation systems. The correctly chosen 400 mm mounting diameter allows the cap to be matched with D400 ducts and other system components of the same diameter.

    Why is it important to seal the duct end?
    An unsealed duct end can cause unintended air leakage, reduce system efficiency, and allow dust or foreign objects to enter. The end cap helps maintain smooth system operation and clearly defines the end of the ventilation run.

    Technical parameters

    Product type End cap for duct
    Purpose Ventilation duct end sealing
    Duct diameter D400 / 400 mm
    Model / designation 400GDO
    Height 50 mm
    Width 400 mm
    Total depth 400 mm
    Mounting diameter 400 mm
    Outer diameter 400 mm
    Material Galvanized steel
    Color Silver
    Application area Ventilation, air supply, exhaust, and technical ventilation systems
    Suitable for use with D400 round ducts and compatible ventilation system elements

    Where is it used?

    • Ventilation systems – for closing the end of a round D400 duct.
    • Air supply systems – for sealing unused or finished duct sections.
    • Exhaust systems – for covering system branches or terminal points.
    • Industrial and technical rooms – where larger diameter metal ducts are used.
    • Warehouses, workshops, outbuildings – for finishing or adjusting ventilation runs.

    Practical installation example

    For instance, a D400 duct branch in a warehouse or production facility ventilation system becomes unused. A 400 mm end cap is installed on the end of the duct, which closes the opening and helps prevent air leakage through the unused part of the system.

    During installation, it is important to check if the cap diameter matches the duct, whether the connection is sufficiently airtight, or if additional fastening, sealing tape, a clamp, or other ventilation installation accessories are required.

    Pros

    • D400 diameter – suitable for 400 mm round ducts.
    • Galvanized steel – resistant to corrosion in typical ventilation conditions.
    • Neat duct finishing – helps aesthetically and technically close a duct end.
    • Helps reduce air losses – closes unused or terminal duct sections.
    • Suitable for technical systems – used in ventilation, air supply, and exhaust runs.
    • Silver color – matches galvanized metal ducts.
    • Simple installation principle – the cap is installed onto the end of a matching diameter duct.

    Cons / limitations

    • Fits only D400 diameter – does not fit smaller or larger ducts without transitions.
    • Check joint airtightness – in some cases, additional sealing may be required.
    • No adjustment function – this is a closing component, not an airflow damper.
    • Additional fasteners may be needed – depends on the duct type and installation location.
    • Not for aggressive environments – specially adapted materials must be selected for highly corrosive or chemical environments.

    Safety and installation notes

    The end cap must be installed so that the duct end is closed securely, stably, and in accordance with the requirements of the specific ventilation system. Before installation, evaluate the duct diameter, system pressure, airflow direction, and fastening method.

    • Check the diameter before installation – the cap is intended for a 400 mm duct.
    • Ensure proper fastening – use clamps, self-tapping screws, sealing tape, or other accessories as needed.
    • Check for airtightness – a leaky joint can reduce the efficiency of the ventilation system.
    • Avoid damage from sharp edges – use appropriate protective equipment when installing metal duct elements.
    • In aggressive environments, verify whether galvanized steel is sufficiently resistant to the specific conditions.

    Quick selection guide

    Galvanized steel D400 end cap – a suitable choice when you need to close a 400 mm round duct end in a ventilation, air supply, or exhaust system. It helps to neatly finish the duct run and reduce unwanted air leakage through unused openings.

    Diameter
    D400 / 400 mm
    Material
    Galvanized steel
    Purpose
    Closing duct end
    Color
    Silver
    Suitable when you need:
    • to close a D400 duct end;
    • to finish a ventilation system section;
    • to cover an unused duct branch;
    • to reduce air leakage through an open duct end;
    • to use a galvanized steel part with metal ducts.
    Check before installation:
    • is the duct diameter definitely 400 mm;
    • is additional sealing required;
    • are clamps or other fasteners needed;
    • will the cap be exposed to aggressive chemical environments;
    • will closing the branch disrupt the operation of the entire ventilation system.
    Important reminder:
    This product is a duct end closing component. It does not regulate airflow, does not function as a damper, and must be selected according to the specific duct diameter and ventilation system schematic.

    FAQ – frequently asked questions

    What is this end cap for?
    It is intended for closing the end of a D400 round ventilation duct.
    What duct diameter does it fit?
    The cap is intended for a 400 mm diameter duct.
    What material is the cap made of?
    The cap is made of galvanized steel.
    Does this cap regulate airflow?
    No. This is a duct end closing component, not a damper or airflow regulator.
    Is additional fastening required?
    This depends on the duct type and installation location. In some cases, a clamp, sealing tape, self-tapping screws, or other accessories may be required.
    Is galvanized steel corrosion-resistant?
    Galvanized steel is resistant to corrosion under typical ventilation conditions, but in aggressive or very humid environments, the need for additional protection must be evaluated.
    Can it be used to close an unused duct branch?
    Yes, the cap can be used to close an unused D400 duct branch if permitted by the specific ventilation system schematic.

    Neat D400 duct finishing for ventilation systems

    The D400 galvanized steel end cap allows for reliably closing a round duct end and maintaining a tidy ventilation system structure.

    Due to its 400 mm mounting diameter, galvanized steel material, silver color, and simple installation principle, this cap is a practical solution for ventilation, air supply, exhaust, warehouse, workshop, and technical room 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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