Air duct testing and balancing services across London and the UK
At Elemental Building Services, we provide professional testing and balancing for air distribution systems to help ensure your ventilation performs as intended. From supply and extract systems to more complex commercial ductwork installations, we measure, adjust and verify airflow so each area receives the correct volume of air.
Whether you are nearing project handover, experiencing uneven airflow, or need support with system commissioning, we deliver a practical, detail-focused service backed by clear reporting and a professional site presence.
What is testing and balancing?
Testing and balancing, often referred to as TAB or air balancing, is the process of measuring system performance and adjusting dampers, terminals, fan settings and related components so the installed ductwork system matches the required airflow as closely as possible.
A properly balanced system helps improve comfort, supports indoor air quality, reduces commissioning issues at handover and helps identify installation or design problems before they become costly operational issues. Guidance used across the industry links good commissioning with achieving the required air distribution, indoor air quality, thermal comfort and energy performance.
Our testing and balancing services
We provide testing and balancing support for a wide range of ventilation systems, including:
- Supply air systems
- Extract air systems
- Return air systems
- Constant air volume systems
- Variable air volume systems
- General ventilation systems
- Commercial and industrial ducted air systems
- Selected residential and mixed-use ventilation projects
Our service can include:
- Review of drawings, schedules and design duties
- Pre-commissioning inspection of the accessible system
- Airflow readings at grilles, valves, branches and main ducts
- Fan setting checks and system adjustment
- Balancing of dampers and terminals
- Identification of access, leakage or installation issues affecting performance
- Witness testing support where required
- Final reporting for handover records
Why testing and balancing matters
Even a well-installed ductwork system can underperform if it is not properly commissioned. Systems that are not balanced can suffer from:
- Rooms receiving too much or too little air
- Hot and cold spots
- Poor extract performance
- Noise caused by excessive velocity or poor regulation
- Unstable system operation
- Delays at handover
- Avoidable energy waste caused by inefficient system settings
The goal is not just to get air moving. The goal is to get the right air quantity to the right place, at the right time.
Our approach
1. Review and preparation
We start by reviewing the available drawings, schedules and design airflow requirements. This helps us understand what the system is supposed to achieve before any readings are taken.
2. Pre-commissioning checks
Before balancing begins, we assess whether the system is ready for meaningful testing. This may include checking access, damper availability, terminal installation, filter condition, power availability and overall readiness of the ventilation system.
3. Airflow measurement
We take site readings using appropriate instruments and methods to establish actual airflow performance across the system.
4. Adjustment and regulation
We progressively regulate the system by adjusting balancing dampers, terminals and other accessible control points to bring airflow closer to the required design quantities.
5. Final verification
Once the system is stable, we verify final readings and record the results for reporting and handover.
6. Reporting
We issue clear documentation showing the measured values, final balanced results and any limitations or observations noted during the works.
Compliance and project support
Our testing and balancing service is suitable for contractors, consultants, facilities teams and building managers who need a dependable commissioning partner.
Where required, we work in line with project specifications and recognised industry guidance. In England, Approved Document F requires mechanical ventilation systems to be commissioned, and non-domestic guidance specifically points to CIBSE commissioning procedures as well as DW/144, DW/154 and DW/143 for relevant ductwork and leakage-testing considerations.
This makes testing and balancing especially important on:
- New build projects
- Refurbishment and fit-out works
- Handover stages
- Problem-solving visits
- Remedial commissioning works
- Projects where air quantities need to be demonstrated and recorded
Who we work with
We support:
- Main contractors
- M&E contractors
- Ductwork contractors
- Facilities management teams
- Building owners and operators
- Consultants and commissioning managers
We can assist on projects in offices, retail units, plantrooms, commercial premises, mixed-use developments and other buildings with ducted ventilation systems.
Reporting and deliverables
Depending on the scope of works, we can provide:
- Site readings
- Terminal and branch airflow results
- Final balancing records
- Observations on system readiness or access limitations
- Handover-style documentation
- Support during witnessed testing
Where a project also requires duct leakage verification, we can support that separately through our ductwork pressure testing service.
Why choose Elemental Building Services?
Elemental Building Services focuses on practical ventilation performance. We understand that testing and balancing is not only about instruments and readings, but also about reading the system properly, spotting site constraints early and helping projects move forward without unnecessary delays.
Our approach is professional, methodical and solutions-focused. We aim to give clients confidence that their system has been checked carefully, adjusted properly and documented clearly.
Need your ventilation system tested and balanced?
Whether you need support at handover stage, help resolving airflow issues, or a dependable partner for ductwork commissioning, Elemental Building Services can help.
Contact us today to discuss your project, request a quotation, or arrange a site visit.