Spiral ducting is usually joined using slip-fit connections, collars or flanged connections, then sealed and mechanically secured where required. The right method depends on duct diameter, pressure, leakage expectations, access and the fitting being connected.
Fusible links are heat-sensitive mechanical release components commonly used in fire dampers, fire shutters and related passive fire protection equipment. This guide explains how they work, where they are used, their limitations and the practical considerations for specifying, installing, inspecting and replacing them.
Circular and rectangular ductwork both have important roles in commercial ventilation and HVAC systems. The right choice depends on airflow requirements, available space, pressure, installation constraints, access for maintenance and project budget. This guide compares their practical differences to help buyers, designers and installers select the most suitable ductwork format.
Galvanised spiral ducting is a circular sheet metal duct system widely used for commercial ventilation, air distribution and HVAC applications. This guide explains its construction, benefits, common applications, components and key specification considerations.
Spiral ducting is one of the most widely used ductwork systems in commercial ventilation. This guide explains how it is made, its advantages, common applications and why it is often chosen for modern HVAC installations.
Air leakage can reduce ventilation performance, increase energy use and make systems harder to balance. This guide explains how DW/144 relates to ductwork leakage, sealing, pressure classes and testing.
DW/144 pressure classes determine how sheet metal ductwork should be constructed for different HVAC operating pressures. Learn about low, medium and high pressure ductwork, reinforcement, sealing and air leakage.
DW/144 is the recognised UK industry standard for the manufacture and installation of sheet metal ductwork used in commercial HVAC and ventilation systems. Published by BESA, it sets requirements for materials, construction methods, pressure classes, reinforcement and air leakage to ensure ductwork is manufactured safely, consistently and to a high standard. It is widely specified by consultants, contractors and building services engineers across commercial and industrial projects.
