Mechanical Ventilation

Circulating fresh air via ducts and fans to meet air quality requirement with the most effective solution

The need for mechanical ventilation

The increased airtightness demanded by Approved Document L for new buildings has given ventilation a paramount role in new developments. This means that there is now a reliance on mechanical solutions to provide movement of fresh air.

Improving Air Quality

Indoor pollution is, on average, already 350% higher than outdoor and, with Part L on the edge of further tightening the building envelop in 2020, the nuisances of poor indoor air quality are only set to get worse. This will certainly increase the importance of appropriate mechanical ventilation strategies in ensuring healthy and moisture-free indoor environment.

Utilising systems 1 – 4

Approved Document F sets out four systems for building specifiers to choose from when designing ventilation systems. From intermittent fans to continuous mechanical supply and extract ventilation with heat recovery, mechanical ventilation solutions exist for the different requirements of different commercial and residential spaces.

1. Background Ventilation and Intermittent Extract Fans.

2. Passive Stack Ventilation.

3. Continuous Mechanical Extract Ventilation (MEV).

4. Continuous Mechanical Supply and Extract Ventilation with Heat Recovery (MVHR).


GDHV Applying Ventilation Systems 1-4 Infographic cover

Applying Ventilation Systems 1-4

This infographic looks at the application options and benefits of the four ventilation systems listed within Part F.

Ventilation: from specification
and design to installation

With mechanical ventilation such an important part of any development, specifying the right system type and product, and understanding its design and installation needs, is vital. GDHV has ventilation specialists and purpose-designed products which can benefit your project throughout every stage of the process.

Key features and Benefits


We offer a range of mechanical ventilation solutions designed with industry and compliance in mind, and our ventilation specialists are on hand to help you specify the best solutions to meet your project’s requirements.


With systems such as MVHR, we are able to engage with building designers to understand building layouts and help to produce detailed ducting drawings, to ensure every bend and run creates the most effective system possible. This can maximise the energy performance of the system once the building is complete and can act as an aid during the installation process.


At GDHV, our ventilation products have been designed with a heavy focus on ease of installation. We know that the issues associated with mechanical ventilation such as noise, increased time spent on complex installation and the challenge of product and ducting inflexibility can be mitigated at the point of product design, helping you to keep a high quality of ventilation installation during construction.


As effective installation is so important to the operational performance of the product; we offer a course to help your engineers gain BPEC certification. Our BPEC training has already been utilised by companies across the industry, resulting in positive effects onsite. These courses can be run at one of our regional training centres or at contractors’ premises using our purpose-built mobile unit.

Speak to our experts

To find out more about our range of ventilation products and services and how they can be applied to your project, contact us to be put in contact with your regional specialist. We also have a Mechanical Ventilation CPD on the different types of ventilation which we would be happy to present to you.