What does BS EN 13141 cover?

It is a series of standards for testing ventilation components for dwellings. Part 7 covers MVHR units, testing airflow, fan power, heat recovery efficiency and noise under defined conditions.

Is BS EN 13141 a legal requirement?

It is a testing standard, not a building regulation. It sets how a unit is measured, not a minimum it must hit. Compliance for an installed system comes from Part F or the relevant national rules.

What is BS EN 13141-7?

The part of BS EN 13141 that covers the performance testing of MVHR units, including airflow rate, electrical power, thermal efficiency and acoustic performance.

Why does the test standard matter?

Because it makes performance figures comparable between units. A figure measured to the standard means the same as another measured the same way, which is what lets you compare fairly.

How to Compare MVHR Units: Efficiency, Fan Power and Noise

BS EN 13141, explained

BS EN 13141 is the European standard, used in the UK, that sets out how ventilation components including MVHR units are tested. It is the reason tested performance figures can be compared fairly. This guide explains what it covers and why it matters when choosing a unit.

By VentRight Editorial · Last updated 2026-07-08 · Impartial · Sourced

What is BS EN 13141?

BS EN 13141 is a series of British and European standards that specify how ventilation components for dwellings are tested for performance. The part covering MVHR units, BS EN 13141-7, tests airflow rate, electrical power, thermal efficiency and noise under defined conditions. It is a testing standard, so it sets how performance is measured rather than a minimum a unit must reach.

Standards like this exist so that a figure quoted for one unit means the same as the figure quoted for another. Without a common method, manufacturers could each measure in their own way and the numbers would not be comparable. BS EN 13141 provides that common method for ventilation products in the UK and Europe.

Why does BS EN 13141 matter when choosing an MVHR unit?

Because it defines the test conditions, BS EN 13141 makes performance figures comparable. A heat recovery efficiency or fan power figure measured to the standard can be compared with another measured the same way. Without a common test, manufacturers could quote best-case numbers that are not comparable. It underpins the figures in the Passivhaus database and the PCDB.

When you compare units on efficiency, fan power and noise, you are relying on those figures having been measured consistently. That consistency is what the standard provides. It is the quiet foundation under the tested numbers you see, which is why the databases that use a common method are more reliable than a marketing headline.

What does BS EN 13141 test?

For an MVHR unit, BS EN 13141-7 tests the airflow rate the unit delivers, the electrical power its fans use, its thermal or heat recovery efficiency, and its acoustic performance, or noise. Together these are the figures that matter when comparing units, which is why a unit tested to the standard gives numbers you can trust and compare.

These four measures line up with what a buyer actually cares about: how much air it moves, how much electricity it uses, how much heat it keeps, and how quiet it is. A unit tested to the standard has those figures established under controlled conditions rather than estimated.

Is BS EN 13141 the same as building regulations compliance?

No. BS EN 13141 is about how a unit is tested, not about whether an installation meets building regulations. A unit tested to the standard gives reliable performance figures, but the installed system still has to be designed and commissioned to meet Part F or the relevant national ventilation rules. The standard tests the product; the regulations govern the installation.

This is a useful distinction. Buying a well tested unit is a good start, but it does not by itself make an installation compliant. Part F, and the equivalent rules in Scotland, Wales and Northern Ireland, govern the design, the rates and the commissioning of the system as installed in your home.

Questions

What does BS EN 13141 cover?: It is a series of standards for testing ventilation components for dwellings. Part 7 covers MVHR units, testing airflow, fan power, heat recovery efficiency and noise under defined conditions.
Is BS EN 13141 a legal requirement?: It is a testing standard, not a building regulation. It sets how a unit is measured, not a minimum it must hit. Compliance for an installed system comes from Part F or the relevant national rules.
What is BS EN 13141-7?: The part of BS EN 13141 that covers the performance testing of MVHR units, including airflow rate, electrical power, thermal efficiency and acoustic performance.
Why does the test standard matter?: Because it makes performance figures comparable between units. A figure measured to the standard means the same as another measured the same way, which is what lets you compare fairly.