Ductwork Component Specialists

As the largest UK manufacturer of Ductwork Jointing Systems and Ductwork Components, Doby Verrolec supply four different flange systems suiting all HVAC needs and providing the lowest air leakage levels. The extensive range of HVAC accessories include, corners, clamps and gaskets. Coupled with our successful DobyGrip Wire Rope Suspension System, we've got it covered!

Products are available direct or through worldwide distributors.

Along with our comprehensive manufacturing process for the production of industry leading ductwork components, we are also able to offer alternative cold rolled and pressed part products. From time-saving cut to length traditional, flat and insulated roller shutter door lath, bespoke profiles and more intricate pressed components. All manufactured to the exacting designs and specifications, providing you with personalised solutions for your project. With expertise in tooling, CNC milling, CNC turning, EDM and Fibre laser we can also offer engineering sub-contract services.

Doby Verrolec were formed with the merger of Doby Cleats Limited and Verrolec Limited in 1999, bringing together over 60 years of manufacturing experience.

Efficiency, quality and innovation have always been at the very centre of our corporate philosophy and entrepreneurial activities. Our highly-qualified and motivated employees and lean working practices make us the success we are.

Doby Verrolec operate all of our business from our site in County Durham, from design through to manufacturing, supporting production and dispatch. Regional wholesalers provide local stock availability to suit specific customer needs, and are supported by highly-trained external sales personnel, who are fully conversant with their own market sector's requirements.

The UK's largest manufacturer of ductwork jointing systems & components.


It's time to rethink some old ideas ...

With a deepening world energy crisis, both businesses and individuals are seeking new ways to conserve energy at work and at home. Doby Verrolec are striving to create new innovative energy conservation products, which are both helpful to the environment and a significant cost saving too.

As the market leader in Ductwork Flange Systems, Doby Verrolec offers efficient, low leakage flange systems. Non-toxic sealant is injected into the flange during manufacture to ensure airtightness and therefore reduced energy loss. It is important to use our full systems to ensure the lowest leakage results.

The UK has one of the largest offshore wind resource in the world, with relatively shallow waters and a strong wind resource extending far into the North Sea. Doby Verrolec’s stainless steel Circular Flange Rings have been used on wind farms due to their airtight seal and their fast installation time.

Our Insulated Door System is purposely designed to provide security and reduce energy costs. The insulated lath design incorporates a CFC Free infill to significantly reduce heat loss and keep sound loss to a minimum.

Doby Verrolec already have the International standard ISO 14001 Environmental policy in place. This provides the environmental framework that as a company can be followed establishing environmental performance requirements.


Doby Verrolec take the matter of quality as something of the utmost importance. Our goal is to get it right first time, every time, striving to exceed customer expectations whenever possible. Customer requirements will always come first with quality, beginning and ending with the customer. Our flexible approach reflects this – both as individuals and as a company committed to excellence.


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