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Radiator fixings: ensuring compliance with Class 3 requirements

When installing radiators, the choice of radiator fixings directly impacts the safety and compliance of the heating system. For installations falling under Requirement Class 3, which demands higher durability and security standards, selecting the appropriate radiator brackets and fixing accessories becomes even more critical. This article outlines essential considerations and best practices for HVAC installers to ensure Class 3 compliance and long-lasting, secure radiator installations.

Understanding Requirement Class 3

The VDI 6036 guideline provides a framework for determining the most suitable fixing systems for radiators. It outlines the appropriate fixings, installation methods, and load-bearing criteria needed for safe and compliant installations and defines 3 requirement classes that refer to the fixing system’s required load-bearing capacity depending on the application.

Whereas Class 2 covers normal to more stringent requirements for the private sector, Class 3 is the classification for radiator installations in more public areas that are subject to higher loads and more demanding conditions. It typically applies to environments where radiators are exposed to

high traffic and potential impact (e.g., schools, youth centres, hospitals, public buildings)
more rigorous operational demands (e.g., commercial spaces, railway stations)
situations requiring tamper-resistant and secure fixings (e.g., escape routes, places of assembly)

Compliance with Class 3 ensures safety, durability and regulatory compliance. By mounting the radiators securely you minimise the risk of damage and accidents. Moreover, it’s essential for passing inspections and adhering to building codes.

Key factors influencing radiator fixing selection

Selecting the correct radiator fixings depends on various factors:

The radiator height, length, depth and weight: heavier radiators, such as cast iron or large panel radiators, require robust fixing systems.
The wall material: when installing radiators, it’s vital to ensure that the fixing is dimensioned in such a way that it’s suitable for the intended use and foreseeable misuse. In particular, the connection to the building structure and its condition, the suitability of the installation accessories and the possible loads must be checked before installation. Brick or concrete walls, for example, support heavier loads with appropriate expansion anchors, while drywall or timber walls may require additional support structures or specialised anchors.
The environmental conditions: areas prone to vibrations or tampering might require reinforced fixings.
The load-bearing requirements: Class 3 installations, for example, must support additional loads, which can require a reinforced mounting system.

Recommended radiator fixings for Class 3 compliance

First of all, the radiator brackets should be selected to support the increased weight and/or stress of Class 3 applications. Wall brackets need to be rated for high-load capacities, for example, and floor brackets can optionally provide additional support, distribute weight evenly and reduce wall load. Anti-lift brackets are essential in public areas to prevent the radiator from being accidentally or deliberately lifted from its mountings. Almost all our radiators that are supplied with radiator brackets comply with at least Requirement Class 2 and often Class 3. If you are in any doubt, please don’t hesitate to contact us for verification.

In addition to radiator brackets, you’ll need the appropriate screws and plugs. Some of the screws and plugs supplied are approved for sand-lime brick and concrete walls. For other wall structures, suitable screws and plugs must be used on site.

Installation best practices

To achieve Class 3 compliance, we recommend the following best practices:

Bracket alignment: ensure the radiator brackets are precisely aligned to support the radiator evenly and prevent unnecessary stress on any fixing point.
Proper spacing between each bracket: follow the manufacturer’s recommendations for bracket spacing to ensure optimal support.
Secure fixings: use the correct combination of anchors, screws and plugs for the wall type and radiator weight.
Testing: the tight fit of the radiator and the correct installation of the anti-lift device must be checked after the installation has been completed.
Thermal expansion: account for expansion and contraction by ensure that radiator fixings can accommodate slight movements without compromising stability.

Conclusion

Planners and installers are required to comply with the VDI standard in order to effectively prevent accidents and damage. By selecting the appropriate radiator brackets, anchors, screws and security fixings, and adhering to best installation practices, you can confidently deliver high-quality installations.

Moreover, aligning with VDI 6036 guidelines strengthens compliance and installation integrity. With the correct tools and knowledge, delivering secure, and long-lasting radiator installations becomes achievable and efficient.

If you would like tailored advice or product recommendations to ensure safe installations, please don’t hesitate to reach out to our technical support team.