Flexit ProNordic L350R is the most powerful commercial air handling unit in the Norwegian ProNordic L range — designed for large office buildings, shopping centres, hospitals, hotels, schools and industrial facilities. With a maximum airflow of up to 5 850 m³/h (at 250 Pa) and a side rectangular duct connection of 1 200×600 mm, it covers large spaces with high heat recovery efficiency (>83 %). The Siemens Climatix CS2500 control system with Modbus communication ensures simple integration into building management systems (BMS). Supplied as a right-hand variant with 400 V configuration, easily convertible to left-hand and 230 V directly on site — making it impossible to order the wrong variant. The unit can be disassembled into modules, reducing the net weight for transport to 348 kg.
Key Benefits
Performance Parameters
Flexit ProNordic L350R delivers an airflow of up to 5 850 m³/h at 250 Pa (SFP <2.0). At a lower setting (SFP <1.5), it achieves 4 400 m³/h at 230 Pa with higher heat recovery efficiency (>86 %). The rectangular side duct connection 1 200×600 mm allows connection to high-capacity duct runs even in space-constrained technical rooms.
@ 250 Pa (SFP <2.0)
(rectangular, side-mounted)
Siemens Climatix CS2500 control system
Integrated control system with constant airflow or 3-speed regulation. Modbus TCP/IP or RTU communication for connection to building management systems (BMS). ProPanel (push-button) or ProTouch (touch-screen display, Android) control panel available as an accessory. Optional BACnet IP module for extended integration into various BMS platforms.
Flexible design — impossible to order wrong
Supplied as a right-hand variant with 3N~400 V configuration. Conversion to left-hand and 230 V is done directly on site. The heating coil (electric 16 000 W or water-based) is installed on site. This flexibility eliminates the risk of ordering the wrong variant and saves costs when project changes occur. The unit is kept in stock at Flexit.
Large commercial buildings — offices, schools, hotels
With an airflow of up to 5 850 m³/h, ProNordic L350R is the most powerful unit in the L range — ideal for large office buildings, shopping centres, hotel complexes, hospitals, school campuses and industrial facilities. The side connection 1 200×600 mm opens installation possibilities even where top duct connection is not feasible.
Robust construction — Nordic Swan Ecolabel
Double-walled panels with thermal insulation and no thermal bridges ensure excellent thermal efficiency. High-quality bag ePM1 55 % (F7) filtration on both supply and extract air captures fine dust and pollen. 5-year manufacturer warranty.
Modular construction for easy transport
ProNordic L350R is designed with a focus on efficient installation and maintenance. All air connections are located on the side of the unit (rectangular connection 1 200×600 mm), enabling optimal duct connection even in rooms with limited ceiling height or overhead obstructions.
The unit can be disassembled into individual modules — rotor module (125 kg), fans (4×15 kg) and doors (4×21 + 2×20 kg) — reducing the net weight for transport to 348 kg. Overall dimensions of 2 410×1 765×1 340 mm require adequate access to the technical room.
Automatic bypass provides free cooling during transitional periods. Filter alarm based on pressure differential alerts when filter replacement is needed.
ProPanel and ProTouch — two control options
ProPanel is a standard push-button control panel for basic operation and unit status overview. Suitable where simple control without advanced settings is sufficient.
ProTouch is a Siemens touch-screen panel (Android) with an application for local connection to the unit. It offers extended settings, visualisation of operating parameters and alarm history. Both panels are supplied separately as accessories.
Technical Specifications
| Parameter | Value |
|---|---|
| Max. airflow (SFP <2.0) | 5 850 m³/h @ 250 Pa |
| Airflow (SFP <1.5) | 4 400 m³/h @ 230 Pa |
| Heat recovery efficiency | >83 % at 5 850 m³/h; >86 % at 4 400 m³/h |
| Heat exchanger type | Rotary (regenerative) |
| Component efficiency (EN 308) | 83.0 % |
| Fan type | B-wheel radial with EC motors |
| Fan power | 4×750 W |
| Rotor motor power | 40 W |
| Max. fan speed | 3 000 rpm |
| Electric heating coil (optional) | 16 000 W |
| Water heating coil | Optional (on-site installation) |
| Rated voltage | 3N~400 V / 50 Hz (convertible to 230 V) |
| Total power (with electric coil, 400 V) | 19 210 W |
| Total power (with water coil) | 3 210 W |
| Rated current (electric coil, 400 V) | 30.6 A |
| Fuse rating (electric coil, 400 V) | 3×40 A |
| Rated current (water coil, 400 V) | 7.4 A |
| Fuse rating (water coil, 400 V) | 3×10 A |
| Duct connection | 1 200×600 mm (rectangular, side-mounted) |
| Filters | Bag ePM1 55 % (F7), 592×592×640 mm |
| Control system | Siemens Climatix CS2500 |
| Communication | Modbus TCP/IP or RTU |
| Fan regulation | ModBus (constant airflow / 3 speeds) |
| Dimensions (W×H×D) | 2 410×1 765×1 580 mm (with handle) |
| Depth without doors | 1 340 mm |
| Gross weight | 657 kg |
| Net weight (transport) | 348 kg |
| Rotor module weight | 125 kg |
| Fan weight | 4×15 kg |
| Door weight | 4×21 kg + 2×20 kg |
| Configuration | Right-hand (convertible to left-hand on site) |
| Installation | Floor-mounted, technical room |
| Control panels | ProPanel (push-button) / ProTouch (touch-screen, Siemens Android) |
| Certifications | Nordic Swan Ecolabel eligible |
| Product no. | 156000 |
| GTIN | 7023671560003 |
ProNordic L350R vs S260R — what sets them apart?
ProNordic L350R — max. 5 850 m³/h at 250 Pa. Side rectangular connection 1 200×600 mm — ideal for installations where top duct connection is not possible. Most powerful unit in the L range, suited for large commercial and industrial buildings. Dimensions 2 410×1 765×1 580 mm, weight 657 kg (net 348 kg).
ProNordic S260R — max. 3 900 m³/h at 250 Pa. Top circular connection — standard solution for HVAC systems with overhead duct runs. More compact (1 810×1 530×1 330 mm, ~409 kg). Recommended for medium-to-large buildings with ceiling duct distribution.
For smaller spaces, consider ProNordic L150R (up to 1 850 m³/h, side Ø315 mm) or ProNordic S220R (up to 2 400 m³/h, top connection). For residential use (family homes), we recommend the Flexit Nordic range — models Nordic S4 (461 m³/h) or Nordic L6 SW (657 m³/h).
Most powerful commercial ventilation in the ProNordic L range. Side connection. Professional control.
Flexit ProNordic L350R is an energy-efficient air handling unit with a rotary heat exchanger, airflow of up to 5 850 m³/h, rectangular side connection 1 200×600 mm and Siemens Climatix CS2500 control — flexible, modular and in stock. 5-year warranty.
| Brand | Flexit |