Features

System features

Aerefy intelligent exhaust valves are direct replacements for existing exhaust valves in bathrooms and bedrooms. The valves detect occupancy and measure indoor air quality parameters such as CO₂, humidity, and temperature, then automatically adjust airflow by opening or closing proportionally as needed.

Existing fresh-air supply valves remain fully open, enabling near free-flow air supply that matches exactly the volume of air extracted through the exhaust system.

Valve operation can be controlled manually or automatically using Aerefy AI control logic. The central air-handling unit (AHU) is equipped with intelligent motor speed control, which adjusts supply and exhaust airflow according to real-time demand

IAQ measurement in every hotel room

Aerefy intelligent exhaust valves include sensors for:

• CO₂

• humidity

• temperature

• pressure

• VOC (volatile organic compounds)

These sensors continuously monitor indoor air quality. Data is transmitted to the Aerefy Cloud and can also be integrated with the building management system (BMS) for analysis and optimization.

Each valve also includes built-in local intelligence. If connectivity is temporarily unavailable, valves continue operating according to preset parameters, ensuring consistently high indoor air quality at all times.

Dasboard

Dynamic airflow adjustment

Airflow rates automatically adjust based on indoor air quality conditions and can vary by up to six times between minimum and maximum settings.

This process is fully automatic and maintains optimal indoor air quality without manual intervention. Reaction time is rapid, keeping CO₂ levels consistently below 1000 ppm.

When a room is unoccupied, ventilation automatically shifts to minimum airflow while maintaining freshness and reducing heating and cooling energy consumption.

Lower noise levels

Aerefy exhaust valves are designed to minimize airflow friction and acoustic disturbance.

In most hotel rooms, ventilation noise is primarily generated by the central air-handling unit or local fan-coil systems. Because Aerefy typically reduces AHU energy consumption by up to two times, overall ventilation system noise is also reduced.

Energy savings

Energy savings come from three main sources:

1. Reduced AHU energy consumption

Lower airflow demand reduces fan operating power.

2. Reduced room heating and cooling losses

Less conditioned air is exhausted unnecessarily, significantly lowering heating and cooling demand. This typically delivers the largest share of total savings, about 35% of heating and cooling energy.

3. Reduced central air conditioning load

Lower airflow volumes reduce the energy required to heat or cool supply air at the AHU.

Battery powered or cabled versions

For retrofit hotel upgrades, rechargeable battery-powered valves are available. Batteries typically last up to two years and can then be removed and recharged.

Battery-powered valves communicate wirelessly with the cloud platform.

Wired versions use Power over Ethernet (PoE). If the hotel already has Ethernet cabling (commonly used for TVs or networking), PoE splitters with integrated switching can provide both power and connectivity.

Optional 24V powered solutions are also available for special installations.

15 year designed service life

Aerefy devices are designed and tested for a service life of up to 15 years, which matches the typical lifecycle of ventilation control components in modern HVAC systems.

100% networked, wired or wireless

Every device in the Aerefy system is fully network-connected, either wirelessly or via cable.

Wireless communication uses LoRa technology, while wired communication uses Ethernet. Bluetooth is used only during installation and commissioning.

Devices can be configured:

• automatically using Aerefy AI

• manually via Bluetooth

• remotely through the web dashboard interface.

API connectivity with BMS and HMS/PMS systems

Each Aerefy valve operates independently with built-in intelligence, ensuring continuous functionality even if communications are interrupted.

Two-way integration with building management systems (BMS) and hotel management/property management systems (HMS/PMS) is supported via API connectivity, either locally or through cloud connections.

Ideal for retrofit and new buildings

Aerefy valves are compatible with round ducts of:

• 100 mm

• 125 mm

• 160 mm

With adapters also available for:

• 90 mm

• 200 mm ducts

Valves replace existing exhaust terminals and are secured with three screws to wall or ceiling surfaces. After removal, ducts remain fully accessible for inspection and maintenance.

For even larger ducts we have damper control unit.

Typical duct maintenance intervals are approximately every five years..

Fast installation with minimal disruption

Wireless valve installation takes approximately five minutes per room and can usually be completed during regular housekeeping service without interrupting hotel operations.

Wired installations take slightly longer due to cabling requirements.

Documentation is available at:

www.aerefy.com/download.

Remote Software upgrade

All Aerefy devices support remote software updates.

This ensures long-term reliability, allows performance improvements through updated AI models, and enables remote adjustment of ventilation parameters when needed.

Software updates are supported for both wired and wireless systems.

Alarms and alerts

System administrators can configure alerts for conditions such as:

• elevated temperature

• excessive humidity

• abnormal occupancy patterns

Future updates will include detection alerts for vaping, cigarette smoke, and cannabis smoke.

How does it work?

Retrofit solution

All exhaust outlets are equipped with Aerefy IoT valves. These valves continuously measure indoor air quality and automatically adjust (open/close) based on actual ventilation needs.

Fresh air supply valves remain fully open, allowing airflow that is naturally balanced in proportion to the exhaust volume.

There are two options for controlling air volumes at the AHU level:

Design drawing 1. Constant pressure control

The AHU maintains constant pressure in both exhaust and supply ducts.

2. Aerefy intelligent control

The AHU is equipped with the Aerefy controller, which dynamically calculates total air demand based on valve positions across the building.

Common areas

Common areas are equipped with duct dampers.

Aerefy 0–10V control units integrate with standard damper actuators, providing flexible design and easy integration into any building.

New building design

Higher energy savings can be achieved by following a few key ventilation principles.

Best results come from using displacement ventilation instead of mixing ventilation.

Displacement ventilation:

Reduces air speed
Improves removal of contaminated air
Works especially well in high-ceiling areas, but also in smaller rooms

Performance is maximized when indoor air quality is continuously monitored and airflow is adjusted to remove only contaminated air.

There are few easy principles for even higher energy savings when designing ventilation. Ideal results will be obtained when using displacement ventilation principles instead of mixing ventilation. Displacement ventilation principles are very effective in case of common high ceiling areas but also smaller rooms, giving lower air speeds and more effective extraction of the contaminated air. It works best when indoor air quality parameters are constantly monitored and air volumes adjusted to extract only contaminated air.

Design principles

Place exhaust valves close to pollution sources
e.g. bathrooms and sleeping areas
Position based on climate
- Humid climates → above shower
- Cold/dry climates → above toilet
Supply fresh air correctly
Use low-velocity linear diffusers above windows, positioned away from exhaust points to avoid short-circuiting
(Alternatively: supply from floor level)
Maintain temperature difference (3–4°C)
Ensures fresh air sinks and pushes contaminated air upward for efficient extraction
Separate ventilation and cooling/heating
Fan Coil Units (FCUs) should operate independently from ventilation
Avoid air recirculation at AHU level
- Improves energy efficiency
- Reduces cross-room contamination risk (important post-COVID)
AHU control strategy
Maintain constant pressure on exhaust and adjust supply proportionally

Key takeaway

Aerefy optimizes airflow room-by-room, ensuring ventilation happens only where and when needed, resulting in:

Lower energy consumption
Better air quality
Reduced system complexity

More information www.aerefy.com/downloads

Everything in the world is demand controlled, setting human in the centre of control. Except social media feed and ventilation. Our devices solve the ventilation.

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