Professional Installation by BOHS Qualified Engineers

Combined Air Limited provides professional installation of Local Exhaust Ventilation (LEV) systems across the UK. Whether you've had a new system designed by a specialist LEV designer, need an existing system relocated, or require additional extraction points added to your current setup, our BOHS qualified engineers ensure your installation is completed to the highest standard.

Our unique advantage is that we bring testing and commissioning expertise to every installation. With P602 design knowledge, we can identify potential issues with a system design before installation begins, potentially saving you significant costs and ensuring the system will perform as intended once installed.

What We Install

Complete New LEV Systems

Installation of fully designed extraction systems including hoods, ductwork, filtration units, fans, and all associated components. We work from designs provided by qualified LEV designers or equipment suppliers.

Additional Extraction Points

Adding new hoods and ductwork connections to existing systems when new processes or equipment are introduced to your workplace.

Replacement Equipment

Installing new filtration units, fans, or extraction equipment to replace end-of-life or inadequate existing units.

System Relocations

Moving extraction equipment and ductwork when production layouts change or your business relocates.

Ductwork Installation

New duct runs, extensions, and modifications including rigid ductwork, flexible connections, dampers, and blast gates.

Hood Installations

Fitting new extraction hoods, capture devices, enclosures, and on-tool extraction connections, ensuring correct positioning for effective capture.

Our Installation Advantage - We Know What Good Looks Like

Most installation contractors simply follow the drawings. We go further.

Our BOHS qualifications mean we understand how LEV systems should perform, not just how they're built. This gives you significant advantages:

P602 Design Review

Before installation begins, we review the system design using our P602 knowledge. If we identify potential performance issues - insufficient airflow, poorly specified components, impractical duct routing - we raise these with the designer before they become expensive problems on site.

P604 Commissioning Expertise

After installation, we commission the system properly using our P604 qualification. This isn't just switching it on - it's verifying the system achieves its intended performance, measuring airflows, and confirming adequate worker protection.

P601 Testing Knowledge

We understand exactly what the system will need to demonstrate during its first statutory thorough examination and test (TExT). We install with testing requirements in mind, ensuring accessibility for future inspections and maintenance.

This means your system is more likely to perform correctly from day one.

Pre-Installation Design Review

Catch Problems Before They're Built In

We offer a pre-installation design review service using our P602 qualification. Before any installation work begins, we can assess the proposed design for:

•  Adequate airflow specifications for the contaminants involved

•  Appropriate hood designs and positioning for effective capture

•  Ductwork sizing and routing efficiency

•  Correct fan and motor specifications

•  Filter suitability for the application

•  Compliance with HSG258 design principles

•  Practical access for future servicing and testing

This review can save significant costs by identifying issues on paper rather than discovering them after installation when changes are far more expensive.

Important: We do not provide LEV system design services. Our design review assesses designs produced by others against HSG258 principles and our practical experience of what works in real-world applications.

Commissioning - Getting It Right From Day One

Installation isn't finished until the system is proven to work.

After every installation, our P604 qualified engineers commission the system properly:

Performance Verification

We measure airflows at all extraction points and compare against design specifications to verify the system achieves its intended performance.

Static Pressure Measurements

We record pressure readings throughout the system to establish baseline data for future comparison during statutory testing.

Baseline Data Recording

All commissioning measurements are documented, providing essential reference data for future thorough examination and tests.

Operator Guidance

We ensure your operators understand how to use the system correctly, including hood positioning, damper settings, and filter change indicators.

Handover Documentation

You receive comprehensive commissioning records including all measurements, system specifications, and maintenance recommendations.

A properly commissioned system provides the benchmark against which all future testing is measured. Without accurate commissioning data, future test results are less meaningful.

Our Installation Process

1. Design Review

We review the provided system design, raising any concerns before work begins.

2. Site Survey

We assess the installation location, identify any practical challenges, and confirm the installation plan.

3. Quotation

We provide a detailed quotation covering all installation works, materials, commissioning, and any identified additional requirements.

4. Installation

Our engineers carry out the installation with minimal disruption to your operations. We coordinate with other trades where necessary and maintain a clean, safe working environment.

5. Commissioning

P604 qualified commissioning to verify system performance and establish baseline data.

6. Handover

Complete documentation including commissioning records, maintenance schedule recommendations, and operator guidance.

7. First Statutory Test

We can arrange the first thorough examination and test (TExT) at the appropriate interval, or provide commissioning data to your chosen testing provider.

Types of Systems We Install

We have experience installing extraction systems across a wide range of industries and applications:

Welding Fume Extraction

Fixed and flexible arm systems, on-tool extraction, downdraft benches, and general ventilation solutions for welding workshops.

Wood Dust Extraction

High-volume dust extraction for woodworking machinery, including CNC routers, saws, planers, and sanding stations.

Metalworking Fluid Mist

Oil mist and coolant mist extraction for CNC machines, lathes, and milling equipment.

Grinding & Polishing

Extraction for bench grinders, linishing belts, polishing lathes, and deburring stations.

General Industrial

Dust and fume extraction for manufacturing processes including cutting, drilling, mixing, and material handling.

Working With Your Designer

We work alongside LEV system designers and equipment suppliers to deliver their designs professionally:

Clear Communication

We liaise directly with the system designer throughout the installation to resolve queries and confirm details.

Design Integrity

We install to the designer's specification, raising any concerns through proper channels rather than making unilateral changes.

Practical Input

Our installation experience means we can offer practical suggestions that improve buildability without compromising design intent.

If you don't yet have a system design, we can recommend qualified LEV designers who can produce HSG258 compliant designs for your application.

Why Choose Combined Air for LEV Installation?

✓  BOHS Qualified Engineers - P601, P602, P603, P604, W201

✓  Pre-Installation Design Review - Catch problems before they're built in

✓  P604 Commissioning - Properly verified system performance

✓  Testing Expertise - We install with future testing requirements in mind

✓  Practical Experience - Over 30 years installing and working on LEV systems

✓  Honest Assessment - We flag design concerns before installation, not after

✓  Complete Service - Installation, commissioning, testing, and ongoing maintenance

✓  Nationwide Coverage - We install across the UK

✓  Ongoing Support - Servicing, testing, and parts supply after installation

Complete Lifecycle Support

Installing your system is just the beginning.

Combined Air Limited can support your LEV system throughout its entire lifecycle:

Installation & Commissioning → Your system installed and verified

Statutory Testing (TExT) → 14-month thorough examination

Preventative Servicing → Regular maintenance to maintain performance

Remedial Works → Repairs and modifications when needed

Parts Supply → Genuine and compatible spares

One provider for your complete LEV needs - from installation through to ongoing compliance.

Book Your LEV Installation

Professional installation backed by genuine LEV expertise.

Service & Parts: 07973 921584

LEV Testing: 07540 165061

Email: Nik@combined-air-limited.co.uk

For installation enquiries, please provide:

•  System design drawings or specifications (if available)

•  Description of the application and contaminants

•  Site location

•  Photos of the installation area (if available)

•  Preferred timescales

For a free, no-obligation quotation, please contact us.