Flexit Nordic KS3 is a compact central air handling unit from the Norwegian Nordic series — engineered for installation directly in the kitchen above the stove or as a cabinet unit in a hallway or utility room. The rotary heat exchanger delivers a temperature efficiency of up to 80 %, airflow up to 260 m³/h and a built-in humidity sensor with full control via the Flexit GO app. Available in right-hand (RER) and left-hand (REL) configurations. The ideal solution for apartments and smaller homes where space is at a premium.
Key Benefits
Smart Control with Flexit GO
Control the unit from anywhere via the mobile app or web interface. Modbus support for smart home integration. Optional CI66 control panel or CO₂ sensor.
Kitchen or Cabinet Installation
Install above the stove between wall cabinets, or as a cabinet unit in a hallway or utility room. Depth of only 318 mm. Conceal behind kitchen cabinet doors or a Flexit design front.
Selectable Cooker Hoods
Choose from Slimline cooker hoods and volume covers in multiple colours. The unit integrates seamlessly into the kitchen design with no visible technical elements.
Healthier Air Throughout the Home
F7 filtration captures dust particles, pollen and allergens. Heat recovery removes excess humidity and CO₂, reducing the risk of mould growth and allergic reactions.
Why a rotary heat exchanger?
A rotary heat exchanger provides higher heat recovery efficiency compared to plate heat exchangers, especially in cold climates. Seasonal heat recovery (summer and winter) is a standard feature of the Nordic range — the unit rejects heat from the supply air in summer and recovers it in winter.
For sub-zero operation, a defrost function is available in the Flexit GO app, preventing ice build-up and ensuring reliable year-round performance.
Annual Energy Savings
Flexit Nordic KS3 significantly reduces heating costs thanks to the high-efficiency rotary exchanger. Estimated annual savings by climate zone (EPREL data):
(e.g. Scandinavia, mountain regions)
(e.g. Central Europe)
(e.g. Mediterranean region)
Technical Specifications
| Parameter | Value |
|---|---|
| Temperature efficiency | up to 80 % |
| Operating airflow range | 90–150 m³/h (25–40 l/s) |
| Max. airflow | 260 m³/h |
| Heat exchanger type | Rotary (regenerative) |
| Filter class | ePM1 55 % (F7) |
| Sound power level | 44 dB(A) |
| Rated voltage | 230 V / 50 Hz |
| Rated power (total) | 679 W (with heater) / 179 W (without) |
| Fan power | 193 W |
| Max. fan speed | 6,500 rpm |
| Duct connection | Ø125 mm |
| Dimensions (W×H×D) | 598×631×318 mm |
| Weight | 45 kg |
| Colour | White |
| Control | Flexit GO (LAN, cloud, app) |
| Compatibility | Modbus, Flexit GO, CI66 panel, CO₂ sensor |
| Cooling recovery | Standard |
| Annual electricity consumption | 291 kWh |
| Configuration | Right-hand (RER) / Left-hand (REL) |
Flexit Nordic KS3 vs Nordic S2 — which model to choose?
Nordic KS3 is designed specifically for kitchen installation or a small cabinet — depth of only 318 mm and an operating range of 90–150 m³/h. Ideal for apartments and smaller homes where there is no room for a large wall-mounted unit. The unit can be concealed behind kitchen cabinet doors with selectable cooker hoods.
For larger family homes with higher airflow demands, choose Flexit Nordic S2 (up to 349 m³/h) or Nordic S3 (up to 361 m³/h) with wall-mounted installation.
Compact heat recovery. Quiet operation. Fresh air in every kitchen.
Flexit Nordic KS3 is a compact air handling unit for kitchens, apartments and smaller homes — featuring a rotary heat exchanger, intuitive Flexit GO control and whisper-quiet operation. Available in right-hand (RER) and left-hand (REL) configurations.
| Model (Exterior side) | REL (Left) or RER (Right) |
| Brand | Flexit |
| Max. air flow m³/h | 250 m³/h |