
Description
BSK Notus Slim MVHR Unit with Humidity Sensor
Bring whole-house heat recovery ventilation to your project with the BSK Notus Slim, available from Ventilation Superstore. This compact unit can be installed vertically on a wall or horizontally on a ceiling, providing flexibility where installation space is limited.
The unit combines lightweight EPP construction, energy-efficient EC fans, an internal humidity sensor and Wi-Fi control. Its quoted airflow is 400 m³/h at 100Pa, with heat recovery efficiency of up to 90%.
Product Code
BSK-NOTUS-SLIM
Key Features
- 400 m³/h airflow at 100Pa
- Wall or ceiling installation
- Lightweight EPP body with metal front cover
- Unit weight: 25kg
- Internal humidity sensor
- Wi-Fi app control and adjustable fan speeds
- Energy-efficient EC fans
- 100% automatic summer bypass
- Up to 90% heat recovery
- A+ energy rating
- Two G4 filters fitted
- Intelligent frost protection
- Mounting brackets supplied
Control and Scheduling
Wi-Fi app control allows you to monitor temperature and humidity, adjust fan speeds and set daily or weekly schedules. The unit also supports control of compatible optional heaters.

An optional black wall controller provides a 4-inch touchscreen for fan-speed control, temperature and humidity readings, scheduling and boost functions. Automatic air-quality control requires the appropriate optional air-quality sensor.

External Connections and BMS Integration
External connections include a volt-free boost input, an expansion port, optional wall-controller connections and connections for compatible pre- and post-heaters. Modbus connectivity supports integration with a compatible building management system. Browser and cloud-control features provide options for remote monitoring and managing multiple units.
Construction and Heat Recovery
The expanded polypropylene body provides lightweight insulation and sound absorption, while the metal front cover protects the unit. Backward-curved EC fans provide airflow, and the PVC counterflow heat exchanger offers up to 90% heat recovery. An optional enthalpy heat exchanger is available.

Filtration and Summer Bypass
Two replaceable G4 filters are fitted, with an optional F7 filter available for the supply-air side. The automatic summer bypass allows air to bypass the heat exchanger when the temperature conditions are suitable. Intelligent frost protection is included.
Installation and Suitable Projects
The Notus Slim can be wall mounted vertically or ceiling mounted, with top or bottom drain points to suit the installation arrangement. Mounting brackets are included.
The supplied product information indicates suitability for new homes up to 240m². Final selection depends on the required airflow, room layout, duct resistance and installation design; floor area alone should not determine unit suitability.
Optional Accessories
- BSK Notus black wall touchscreen controller
- Compatible momentary boost switch
- Optional supply-air F7 filter
- Compatible duct heaters
- Optional air-quality sensor
Optional accessories are separate from the ventilation unit unless expressly included in your selected package.
Technical Information



Order from Ventilation Superstore
Contact Ventilation Superstore for help matching the Notus Slim to your ventilation requirements and selecting compatible ductwork or controls.
Frequently Asked Questions
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What's the difference between MVHR units from different brands?
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Is a heat recovery system worth the extra cost over standard ventilation?
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Can I replace my existing extractor fans with an MVHR system?