Ductwork

A duct route affects more than the space directly below it. Changes can influence connected branches, fan duty and the distribution of air elsewhere. We establish the affected system so a local modification does not become an unexplained loss of performance in another part of the premises.

The scope covers surveys, fabrication and installation of defined duct routes, fittings, supports, terminals and access provisions. It identifies insulation, sealing and associated building work where required. Repair and alteration work starts from the existing system's purpose and condition.

Deliverables include the agreed layout, installed changes and relevant inspection or commissioning records. Access requirements remain part of the design: components needing future inspection or cleaning must be reachable. A route that fits above the ceiling but blocks maintenance access is not a complete solution for the building team.

Duct size, route and fittings affect resistance, noise and available airflow. The design must relate to the fan and intended duty rather than use whatever space is left after other services are installed. Changes to branches need consideration of the wider distribution and any balancing required.

General ventilation, kitchen extract and local exhaust ventilation have different purposes and requirements. Their ductwork should not be treated as interchangeable. Penetrations through fire-resisting construction, dampers and specialist protection also need the relevant design and trade coordination. The instruction identifies those interfaces before openings or alterations are made.

Provide plans, existing drawings, airflow information and details of the plant serving the route. Identify proposed room changes, known restrictions and previous cleaning or inspection findings. Confirm whether the brief concerns a local repair, a new branch or a redesigned system.

Access information should cover ceiling voids, risers, roofs and occupied spaces. Include available asbestos information where relevant to the affected building materials and the required survey arrangements before disturbance. Establish working hours, isolation authority and the people coordinating other trades. Accurate route information helps avoid conflicts with lighting, pipework and structural elements.

We establish the system requirement and survey the route. The proposal resolves dimensions, supports, access points and connections, together with interfaces requiring specialist input. Installation is coordinated with the building programme so the ductwork can be inspected before it is concealed.

Completed work receives the checks appropriate to the agreed specification. Where airflow changes, the scope includes the relevant commissioning or balancing activity. Handover records the route and remaining actions, including inaccessible sections. Any required making good and specialist interface records should be collected with the installation information rather than left in separate contractor correspondence.

Route length, material, dimensions, fittings, access and working height affect cost. Insulation, specialist protection, supports and restricted working hours add different requirements. A straight accessible run has a different installation effort from a route through occupied ceilings and several constrained risers.

Plan shutdowns and work areas before installation. Dust protection, removal routes and coordination with ceiling reinstatement affect the programme. Compare quotations against the same specification, including access provisions, commissioning and records. Leaving these tasks out can produce a physically installed duct that the client cannot maintain or use as intended.

Offices need routes coordinated with meeting rooms, lighting and ceiling access. Retail estates need alterations planned around trading, displays and deliveries. Hospitality needs general ventilation distinguished from kitchen extraction requirements.

Industrial premises need process and general air systems kept clearly defined. The full service and project offering supports all sectors. The specification follows the air being carried, the system duty and the building interfaces rather than applying one construction detail everywhere.

We cover Northumberland, Tyne and Wear, County Durham and Tees Valley, including Berwick-upon-Tweed, Alnwick, Morpeth, Hexham, Newcastle, Gateshead, Sunderland, Durham, Darlington, Hartlepool, Stockton-on-Tees, Middlesbrough and Redcar.

For several sites, supply the local layouts and access restrictions as well as the common programme. Similar buildings can have different concealed routes and maintenance constraints. View all locations.

Read HVAC balancing and air-handling units. HSE ventilation guidance explains the wider purpose of maintaining effective workplace ventilation.