DU-IV Gastight Door 900 × 2000: Technical Analysis of an Airtight Door for Civil Defence Shelters
Modern civil defence shelters and protected facilities require entrance systems capable of maintaining an airtight barrier between the protected interior and the external environment. In vestibule configurations, gastight doors serve as a critical engineering component by preventing the penetration of hazardous substances while preserving the integrity of the shelter envelope.
The DU-IV Gastight Door is designed specifically for this purpose and is available through the official Shelter Shop product catalog:
Official product page:DU-IV Gastight Door 900 × 2000
Purpose of the DU-IV Gastight Door
According to the manufacturer, the DU-IV Gastight Door is intended for installation in the openings of civil defence shelters and protective structures.
Its primary application is as a secondary door installed in a vestibule or airlock, where it helps prevent the penetration of toxic substances into the protected interior space. This configuration forms part of the shelter sealing system and supports the maintenance of an airtight environment. atmasgroup.com
Airtight Sealing Principle
The sealing performance of the DU-IV door is achieved through a dedicated mechanical locking mechanism.
According to the manufacturer:
the door leaf is pressed tightly against the frame;
locking is performed by a moving locking mechanism;
the mechanism operates through a wedge clamping system;
the wedge system produces the airtight seal required for the product.
This mechanical compression system enables uniform contact between the door leaf and the frame to establish the required gastight perimeter. atmasgroup.com
Installation Application
The product is intended for installation in:
civil defence shelters;
protected structures;
vestibules or airlock serving protected facilities.
The manufacturer specifies that the DU-IV functions as a secondary vestibule or airlock door rather than a primary blast entrance door. Its purpose is to maintain the sealed internal environment after the primary protective door has been closed. atmasgroup.com
Standard Door Size
The product page identifies the standard model as:
DU-IV Gastight Door 900 × 2000
Standard clear opening dimensions:
Width: 900 mm
Height: 2000 mm
The product is supplied in this standard size configuration. atmasgroup.com
Surface Finish
According to the official product description, the DU-IV Gastight Door is supplied with a primer coating.
The product page also states that the doors are available with primer coating in:
brown;
black.
This coating prepares the steel surface for subsequent finishing where required. atmasgroup.com
Mechanical Construction
The manufacturer describes the operating principle as follows:
moving locking mechanism;
wedge clamping system;
compression of the door leaf against the frame;
airtight sealing of the complete assembly.
These components work together to create the sealing performance required for civil protection shelters. atmasgroup.com
Functional Role in Shelter Design
Within a protected facility, the DU-IV Gastight Door serves to:
isolate the protected interior;
reduce the risk of hazardous substance penetration;
provide airtight separation within vestibule layouts;
support the overall shelter sealing concept.
The product is specifically described as part of the shelter's protective entrance arrangement rather than as a general-purpose architectural door. atmasgroup.com
Technical Summary
Parameter | Specification |
Product | DU-IV Gastight Door |
Intended use | Civil defence shelters and protective structures |
Installation | Secondary vestibule or airlock door |
Standard size | 900 × 2000 mm |
Operating principle | Mechanical locking with wedge clamping system |
Function | Airtight sealing |
Surface finish | Primer coating |
Available primer colors | Brown or Black |
All specifications listed above are taken from the official manufacturer product information. atmasgroup.com
Advantages Based on Published Product Information
According to the official product description, the DU-IV Gastight Door provides:
dedicated installation for civil defence shelters;
airtight sealing through mechanical compression;
wedge clamping locking mechanism;
installation in vestibule or airlock configurations;
standard 900 × 2000 mm dimensions;
primer-coated steel finish supplied in brown or black.
No additional performance characteristics beyond those published by the manufacturer are included in this article. atmasgroup.com
Conclusion
The DU-IV Gastight Door 900 × 2000 is engineered as an airtight steel door for civil defence shelters and protected facilities. According to the manufacturer, it is intended for installation as a secondary vestibule door where the moving locking mechanism and wedge clamping system compress the door leaf against the frame to achieve the required airtight seal. The product is supplied with a primer coating in brown or black and is offered in the standard 900 × 2000 mm configuration. These published characteristics make the DU-IV a dedicated component of shelter entrance systems requiring reliable gastight performance. atmasgroup.com
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