Introducing the BSK NOTUS Slim: Flexible MVHR for Space-Conscious Installations

Finding enough space for an MVHR unit can be one of the biggest challenges when designing a whole-house ventilation system. For installers working with compact plant rooms, utility cupboards or limited ceiling space, choosing a unit that offers installation flexibility without compromising on performance is essential.

The BSK NOTUS Slim is a compact, high-performance Mechanical Ventilation with Heat Recovery (MVHR) unit designed to make installations easier where space is restricted.

With airflow rates of up to 400 m³/h at 100 Pa, heat recovery efficiency of up to 90%, integrated Wi-Fi controls and flexible wall or ceiling mounting, the NOTUS Slim offers a practical solution for modern residential ventilation projects.

In this guide, we'll explore the key features, technical specifications and benefits of the BSK NOTUS Slim, including how it compares with the existing NOTUS 350.

What Is the BSK NOTUS Slim?

The BSK NOTUS Slim is a whole-house MVHR unit designed to provide continuous fresh air ventilation while recovering heat from extracted indoor air.

Part of BSK's NOTUS heat recovery range, the unit has been developed with a slimline construction that allows installation in spaces where conventional MVHR units may be difficult to accommodate.

At just 240mm deep, the NOTUS Slim offers increased installation flexibility while maintaining the airflow capacity required for a range of residential ventilation systems.

Its design allows for both horizontal ceiling mounting and vertical wall mounting, making it particularly suitable for installations with limited available space.

For full product information, visit the BSK NOTUS Slim manufacturer's product page.

Key Features of the BSK NOTUS Slim

The NOTUS Slim combines practical installation features with smart ventilation technology.

1. Flexible Wall or Ceiling Installation

One of the main advantages of the BSK NOTUS Slim is its flexible mounting configuration.

The unit can be installed:

• Vertically on a wall
• Horizontally on a ceiling

This provides installers with additional options when planning equipment placement and ductwork routes.

Its slimline construction makes it a particularly useful option for properties with restricted plant space, provided there is adequate access for installation and maintenance.

2. Powerful Airflow Up to 400 m³/h

Despite its compact design, the BSK NOTUS Slim delivers a maximum airflow rate of 400 m³/h at 100 Pa.

This makes it suitable for a range of residential ventilation applications when correctly specified as part of the overall MVHR system.

The unit features energy-efficient EC fan technology, providing controlled airflow with adjustable operating speeds.

As with any MVHR installation, the correct unit should be selected based on the property's required ventilation rates, ductwork resistance and overall system design.

3. Up to 90% Heat Recovery Efficiency

The BSK NOTUS Slim incorporates a high-efficiency counterflow heat exchanger designed to recover heat from outgoing stale air before it leaves the property.

With heat recovery efficiency of up to 90%, the system helps retain valuable thermal energy while supplying fresh air throughout the home.

This process reduces ventilation-related heat loss compared with uncontrolled ventilation, making MVHR particularly beneficial for modern airtight and energy-efficient properties.

4. Built-In Wi-Fi and Smart Controls

The NOTUS Slim includes integrated Wi-Fi connectivity, allowing users to monitor and control their ventilation system through the BSK Connect mobile application.

This gives homeowners and installers access to ventilation settings without needing to operate the unit directly.

Smart control options include:

• Adjusting ventilation speeds
• Monitoring temperature and humidity readings
• Managing ventilation settings remotely
• Accessing compatible system controls

For installations requiring an additional physical controller, a dedicated touchscreen is also available.

Quiet-Vent supplies the BSK NOTUS 4-Inch Wall Controller, allowing users to monitor and adjust compatible system settings from a wall-mounted interface.

5. Integrated Temperature and Humidity Sensors

The NOTUS Slim includes temperature and humidity sensing as standard.

These sensors allow the ventilation system to respond to changing indoor conditions.

For example, when humidity levels increase due to activities such as showering, bathing or cooking, the unit can increase ventilation to help remove excess moisture.

This automatic functionality can help maintain more consistent indoor air conditions without requiring frequent manual adjustments.

6. Automatic Summer Bypass

During warmer weather, recovering heat from outgoing air is not always desirable.

The NOTUS Slim incorporates an automatic summer bypass function that allows incoming outdoor air to avoid the heat exchanger when conditions are suitable.

This can help reduce unwanted heat recovery and improve indoor comfort when the outdoor air is cooler than the indoor air.

Important: Summer bypass is not active cooling or air conditioning. It does not refrigerate incoming air or reduce its temperature below the outdoor temperature.

7. Energy-Efficient EC Fans

The NOTUS Slim uses electronically commutated (EC) fan technology to provide efficient and adjustable ventilation.

EC motors are designed to offer precise airflow control and energy-efficient operation.

This allows installers to configure ventilation rates according to the property's requirements during commissioning.

8. Flexible Duct Connections

The BSK NOTUS Slim supports 125mm and 160mm duct connections, giving installers additional flexibility when planning the main ventilation ductwork.

The appropriate duct dimensions should be selected based on system airflow requirements, pressure losses and the overall ventilation design.

Explore Quiet-Vent's range of MVHR units and heat recovery systems for additional residential ventilation options.

BSK NOTUS Slim – Technical Specifications

The BSK NOTUS Slim combines powerful ventilation performance with a compact construction and modern control features.

Ventilation Performance

• Maximum Airflow: 400 m³/h at 100 Pa
• Heat Recovery Efficiency: Up to 90%
• Heat Exchanger: High-efficiency counterflow
• Fan Technology: Energy-efficient EC fans
• Summer Bypass: Automatic
• Filtration: G4 filters as standard
  

Dimensions & Installation

• Dimensions: 750 × 240 × 1250mm
• Unit Depth: 240mm
• Weight: Approximately 24kg
• Mounting: Vertical wall or horizontal ceiling
• Duct Connections: 125mm / 160mm

Controls & Electrical

• Wi-Fi Connectivity: Standard
• Mobile Application: BSK Connect
• Temperature Sensor: Integrated
• Humidity Sensor: Integrated
• Optional Controller: 4-inch touchscreen
• Power Supply: 230V / 50Hz
• Maximum Electrical Power: 150W

These specifications are based on the manufacturer's published information. Actual system performance will depend on installation conditions, ductwork design and commissioning.

Why Is the NOTUS Slim Suitable for Installers?

Installation flexibility is an important consideration when specifying MVHR systems.

A unit may provide excellent ventilation performance, but if there is insufficient space for positioning, ductwork connections or future maintenance, installation can become challenging.

The BSK NOTUS Slim has been developed to address some of these practical considerations.

Benefits for installers include:

• Slim construction suitable for restricted spaces
• Flexible wall or ceiling mounting
• Adjustable ventilation performance
• Integrated temperature and humidity sensors
• Wi-Fi connectivity for convenient control
• Optional touchscreen controller
• Automatic summer bypass
• Compatible duct connection options

These features make it a practical choice for installers working across residential new-build and suitable renovation projects.

What Should Installers Consider Before Specifying the NOTUS Slim?

Although the NOTUS Slim offers flexible installation options, correct system design is essential.

Before selecting the unit, installers should consider:

Required Ventilation Airflow

The unit must be capable of meeting the property's required ventilation rates at the expected system resistance.

Maximum airflow alone should not determine unit selection.

Installation Space

Although the NOTUS Slim has a shallow profile, sufficient space must be allowed for ductwork connections, access panels, filter replacement and routine servicing.

Ductwork Design

Correct duct sizing and routing help minimise unnecessary pressure losses and noise.

Quiet-Vent supplies a range of semi-rigid radial ductwork and rigid ductwork for suitable ventilation installations.

Condensate Drainage

Heat recovery systems can produce condensate during normal operation.

The NOTUS Slim must be installed with any required drainage arrangements in accordance with the manufacturer's instructions.

System Commissioning

The ventilation system should be correctly balanced and commissioned to ensure it delivers the required airflow throughout the property.

For guidance on ventilation requirements in England, refer to the UK Government's Approved Document F: Ventilation. Requirements may differ across other UK jurisdictions and Ireland.

Discover the BSK NOTUS Slim at Quiet-Vent

The BSK NOTUS Slim brings together powerful airflow, efficient heat recovery and flexible installation in a compact whole-house MVHR unit.

With up to 400 m³/h airflow, a slim 240mm profile, Wi-Fi connectivity and integrated humidity sensing, it provides a versatile ventilation solution for installers and merchants.

At Quiet-Vent, we work with ventilation professionals and merchants across the UK and Ireland, supplying quality ventilation equipment, technical product advice and trade support.

Whether you're specifying an MVHR system for a new-build property or exploring ventilation options where installation space is restricted, the BSK NOTUS Slim offers an efficient, space-saving solution.

Ready to explore the BSK NOTUS Slim?

View the BSK NOTUS Slim MVHR Unit at Quiet-Vent

Alternatively, explore our full range of MVHR units to discover more heat recovery ventilation solutions for your next project.

For product enquiries or technical advice, contact the Quiet-Vent team.