Mechanical Extract Ventilation

Mechanical Extract Ventilation (MEV) is a whole-house ventilation system that extracts air continuously at a low rate from wet rooms. Because the system operates continuously, it creates negative pressure in the building. Replacement air is introduced to the building through either window or wall vents (or a combination of both). This system provides much better protection against condensation and mould than the traditional intermittent extractor fans.

It is a low-energy, continuous mechanical extract ventilation system designed with multiple extract points to simultaneously draw moisture-laden air out of the wet rooms (bathrooms and kitchen) providing a quieter and more efficient system compared to separate fans.

Continuous mechanical extract ventilation is designed to work at a low background level of extraction with an occasional boost when required.

Benefits of MEV Systems


Improved Indoor Air Quality

Maintain a healthy & comfortable indoor environment inside your house free from stale air and pollutants. Helps control humidity, VOC’s and odours within your home.

Cost Effective

Using a single, central extractor fan unit is more cost-effective in houses than having individual extractor fans (with their individual wiring, switches, holes through walls, grills, etc) in each area requiring ventilation.

schematic of indoor air flow

Continuous Operation

The central mechanical extract fan runs silently and continuously at predetermined rates to remove pollutants and excessive humidity without switching the extraction fan on or off.

installation ducobox mev

Easy Installation & Low Maintenance

Unlike MVHR, MEV Systems are fairly easy to install and require little to no maintenance.

Our Products

Envirovent Spider MEV

EnviroVent Spider

Ducobox Silent

DucoBox Silent

Ducobox Silent

DucoBox Silent Connect

DucoBox Focus

How do MEV Systems Work?

Continuous mechanical extract ventilation (MEV) systems constantly remove moisture-laden air from the kitchen and wet rooms by connecting a remote central fan to multiple extract valves via ductwork.

The central extract fan is typically located in a loft space or hallway cupboard with a system of ductwork and grilles extending to each room requiring extract ventilation.

The extracted air is then normally discharged to the outside via a single duct and grille/cowl.

To save time and effort, continuous MEV systems can be linked to various switches or sensors that instruct the system to boost when necessary.

how-mev-works copy

Why Choose Flynn Heat Recovery Systems?

Flynn Heat Recovery Systems has been providing ventilation systems for over 16 years, and we have extensive expertise in designing and installing MEV systems for a wide range of properties.

Our team of experts will work with you to design a customised MEV system that meets your specific needs and budget. We use only the highest quality components and equipment to ensure that your system is reliable and efficient.

We pride ourselves on delivering exceptional customer service, and our team is always on hand to support and advise our clients. Contact us today to discuss your requirements and find out how we can help you achieve a more sustainable and energy-efficient home or business.


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