Hocklynn fabricates custom metal ducting and ductwork components for industrial, commercial and specialist applications. From one-off bespoke duct sections and fume extraction hoods to repeat production of standardised ductwork components, we manufacture sheet metal ducting to your specification at our Bristol facility.
Standard catalogue ductwork suits the majority of building ventilation and HVAC installations. But many industrial and commercial applications require ductwork in non-standard sizes, shapes, materials or gauges that off-the-shelf suppliers cannot provide. Custom fabricated metal ducting fills this gap, delivering ductwork components that are engineered to fit your specific installation, process requirement or equipment interface.
We work with contractors, equipment manufacturers and ventilation specialists who need metal ducting fabricated to precise specifications. Whether you need a single transition piece to connect two different duct sizes, a set of heavy gauge extraction hoods for a production line, or a run of rectangular ductwork in a non-standard material, we can produce it from your drawings or work with you to develop a solution.
Our custom ductwork fabrication covers a wide range of component types and configurations. We produce rectangular ducting in any combination of width, height and length, including non-standard aspect ratios and heavy gauge construction that goes beyond the capabilities of standard ductwork suppliers. Rectangular duct sections can be supplied with flanged, slipjoint or welded connections depending on the application and the pressures involved.
Transition pieces, reducers and adapters connect ductwork of different sizes, shapes or orientations. These components are frequently needed where new equipment interfaces with existing duct runs, or where process requirements demand changes in duct cross-section along the air path. We fabricate transitions from rectangular to circular, from one rectangular size to another, and offset sections that accommodate structural obstacles or equipment positions.
Fume extraction hoods and capture hoods are designed to collect airborne contaminants at source. These range from simple canopy hoods above process equipment to close-capture hoods that enclose the emission point as completely as practical. The effectiveness of a capture hood depends on its geometry, face velocity, and proximity to the contaminant source. We fabricate extraction hoods in mild steel, stainless steel and galvanised steel, with options for integral dampers, access doors and connection flanges.
Plenums, distribution boxes and manifolds serve as junction points in ductwork systems where airflow needs to be split, combined or redirected. We fabricate these components with internal baffles and flow distribution features where required to maintain even airflow across the connected branches.
Access doors, inspection hatches and cleaning panels allow maintenance access to the interior of ductwork for inspection, cleaning and component replacement. We can incorporate access openings into any fabricated duct section, with doors hinged, removable or bolted depending on the frequency of access required and the operating pressure of the system.
The choice of material for custom metal ducting depends on the substances being conveyed, the operating temperature, the environment through which the ductwork passes, and the required service life.
Galvanised steel is the standard material for general ventilation, heating and air conditioning ductwork. The zinc coating provides effective corrosion resistance for indoor applications and moderate outdoor exposure. We fabricate galvanised ductwork from pre-galvanised sheet and from plain steel with post-fabrication galvanising where the application requires it.
Mild steel ducting is used for applications involving higher temperatures, heavier gauges, or where the ductwork will be painted or powder coated to match surrounding equipment or architectural finishes. Mild steel also suits applications where welded construction is preferred over folded and sealed joints, such as high-pressure systems and heavy industrial extraction.
Stainless steel ducting is specified for corrosive environments, food and pharmaceutical production areas, laboratory fume extraction, and any application where hygiene, cleanability or chemical resistance are requirements. We work with 304 and 316 grade stainless steel for ductwork fabrication, with welded joints cleaned using our electrolytic weld cleaning process to restore full corrosion resistance.
Aluminium ducting serves applications where weight is a constraint, such as rooftop installations, suspended systems in buildings with limited structural capacity, and mobile or temporary extraction equipment. Aluminium also offers natural corrosion resistance for outdoor and marine environments.
We fabricate custom metal ducting for a diverse range of applications across industrial, commercial and specialist sectors.
Industrial fume and dust extraction systems require ductwork that handles abrasive particles, chemical fumes, welding smoke, oil mist and other airborne contaminants. These systems often demand heavier gauge construction, wear-resistant materials, and component designs that minimise accumulation of material within the duct system. We fabricate extraction ductwork for manufacturing facilities, engineering workshops, chemical processing plants and waste handling operations.
Kitchen and commercial catering extract ductwork moves grease-laden air from cooking areas to external discharge points. This ductwork must be fabricated from materials that withstand regular cleaning, grease accumulation and high operating temperatures. Stainless steel and galvanised steel are the standard materials for kitchen extraction, with welded seams and smooth internal surfaces that facilitate cleaning.
Process air systems in manufacturing and industrial applications move heated, cooled, conditioned or filtered air around production areas. Custom ductwork components connect air handling units, process equipment and room distribution points in configurations that standard catalogue ductwork cannot accommodate.
Laboratory and cleanroom ventilation systems require ductwork that meets stringent hygiene and contamination control requirements. Stainless steel construction with fully welded, ground and polished seams is typical for these applications. We fabricate laboratory fume cupboard connections, filter housings and clean air distribution ductwork.
Every custom ductwork project begins with a review of your drawings, specifications or site requirements. You can supply us with CAD files, fabrication drawings, sketches, or simply the dimensions and connection details for the components you need. If you are working from a system design produced by a ventilation engineer or building services consultant, we can fabricate directly from their specification.
Our fabrication capabilities include CNC laser cutting for precise flat development of duct profiles, CNC press brake folding for accurate bends and seams, TIG and MIG welding for strong and airtight joints, and powder coating or specialist finishing where required. We can produce ductwork in gauges from thin ventilation-grade sheet through to heavy structural plate, depending on the application.
We produce custom ducting in quantities from single components to production batches. For customers with ongoing ductwork requirements, all job data is stored so that repeat orders can be called off quickly with no additional setup.
If you need custom metal ducting fabricated to your specification, contact our team to discuss your requirements. We can work from your drawings or help you develop a solution based on your installation and process needs.
