Achieving Net Zero Classrooms with Minimum Energy Waste

To achieve Net Zero in schools, we need to minimise heat loss, reducing heat plant and fossil fuel consumption. AirMasters can recover up to 90% of the classrooms heat and have a low specific fan power, making them the ideal holistic choice for Net Zero classrooms.

AirMaster Product Range

In this table you will see all the relevant key data for the AirMaster product range:

Key Statistics AM 150 AM 300 AM 500 AM 800 AM 1000 AM 900 AM 1200
Capacity (l/s) 41 76 153 201 292 222 – 230 294 – 363
Capacity (m³/h) 147 275 550 725 1050 800 – 830 1060 – 1310
Max. SFP (W/l/s) 1.2 1.5 0.9 0.9 1.0 1.0 0.7
Heat recovery efficiency (%) 86% 87% 90% 89% 88% 96% 97%
Dimensions W x H x D (mm) 1170 x 261 x 572 1180 x 344 x 705 1600 x 439 x 779 1910 x 474 x 916 2325 x 561 x 1283 800 x 2323 x 602 – 687 496 x 2098 – 2406 x 2427
Weight (kg) 47 85 108 157 302 180 545 – 630
Duct connections (ø mm) 125 160 250 315 315 315 400

Key features and benefits

Ensures good indoor air quality regardless of the external conditions

Draught-free air distribution using the Coanda effect, without ducts or diffuser grilles

Low noise: only 35 dB(A) at 1m

< 30 dB(A) for SEN classrooms

ePM10 50% (M5) minimum filter grade

Demand control links fan speed to room CO₂ levels

49 dB attenuation of external noise

BB101 and BB93 compliant

Online monitoring on our Internet of Things platform, Airlinq Online

Automatic summer bypass and night-time cooling

No recirculation of classroom air

Low SFP, high heat recovery

Airmaster diagram_UK

The Benefits of Decentralised MVHR

The first step on the road to Net Zero is to achieve energy savings.
In the UK, a substantial quantity of these energy savings will be realised by reducing heat loss in existing buildings. Consequently, our building fabric needs to be improved.

However, a classroom’s ventilation demand is significant. The air within these rooms contains a great deal of heat, which we need to conserve if we are to achieve our Net Zero goals.

Using mechanical ventilation with heat recovery (MVHR), we can supply air to the room at an appropriate temperature, whilst maintaining good indoor air quality. AirMaster achieves this with a high heat recovery efficiency and low specific fan power.

AirMaster is a Danish product, which was created approximately 30 years ago. Therefore, we benefit from decades of Danish experience
in the mitigation of heat loss, with minimal energy waste


Explore our units and find out more about technical features and installation suitability.

AM 150, AM 300, and AM 500

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AM 1000

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AM 800

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AM 900 and AM 1200

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Airlinq Online

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The Impact of CO2 on Learning

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AirMaster SMVs

AirMaster Smart Mechanical Ventilation units (SMVs) are decentralised MVHR. They consume a very small amount of energy due heat exchangers, but also have a very low specific fan power (SFP). This is made possible because they use the Coanda Effect to distribute air in the room. Using the Coanda Effect also means that no distribution ductwork is required.

AirMasters are typically fitted with integrated CO2 sensors, enabling demand-controlled ventilation. This benefits both indoor air quality and energy usage: when occupancy is high, the ventilation rate increases, improving the indoor air quality; when occupancy is low, the ventilation rate decreases, reducing energy consumption.

By using heat recovery, the Coanda effect, and having low specific fan powers, AirMasters achieve much lower energy performance than centralised and hybrid mixer boxers, making them an optimal choice for Net Zero school design.

AirMaster for Educators

Increasing CO₂ concentrations have a major impact on both the indoor and outdoor environment. To reduce carbon emissions, buildings have been made more air-tight, reducing heat loss and making them more energy efficient. But this is a double-edged sword; with inadequate ventilation, an air-tight room will suffer from poor air quality and a high CO₂ concentration.

Link to impact of CO2 document?

AirMaster for Passivhaus

In July 2021 the AirMaster AM 1000 was awarded Passivhaus Component certification under the category of “Decentralised ventilation system (school room).” This makes it possible to use the AM 1000 in Passivhaus school classrooms, as well as other Passivhaus certified buildings.

For Passivhaus schools, the AirMaster AM 1000 is a low-SFP alternative to centralised systems.

AirMaster Sites in the UK.

Please see the AirMaster site locations in the UK below.

AirMaster Documents

Please find relevant links for further reading below, or visit our downloads page.

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