Product Range


from 250 to 3,000 m³/h

The FXS-FLEX series includes high efficiency heat recovery units for floor installation and high configuration flexibility. They are available in a vertical construction, and combine total freedom in the arrangement of air inlets/outlets in various positions (front/top/side), both a priori and on site. All this makes them an ideal product for internal installation in confined spaces or close to walls, with minimum obstruction.
The FXS-FLEX series comes in 5 models, with flow rates from 250 to 3,000 m3/h.
The FXS-FLEX range is equipped with an aluminium plate heat recovery unit, fans with EC motors and an integrated motorised by-pass system for free-cooling operation, in addition to the innovative KVir accessory for air sanitation with UV lamp and polyvin yl-amino matrix virus filter. In the FXS-FLEX range, the KVir accessory can be installed fully integrated inside the unit.

  • Supporting frame in extruded thermal break aluminium profiles.
  • Sandwich panels th. 42 mm in internally galvanised sheet and pre-painted externally in RAL 9002 finish.
  • Non-flammable thermal and acoustic> insulation in high insulation mineral wool.
  • Enthalpy rotor type high efficiency heat recuperator unit with aluminium exchanger and galvanised steel frame. Transmission to the electric motor by means of an adjustable tension belt. Dual central and circumferential seal for the reduction of air leaks. Rigid pocket filters with polystyrene frame with polyurethane seal and medium water-repellent fiberglass. Efficiency class ePM10 70% on room return and ePM1 50% on outdoor air intake
  • Centrifugal fans with free-running impeller with backward blades directly coupled to EC technology electric motors
  • Recessed type electrical panel with electronic adjustment and remote user interface for complete control of all the key functions and specifically:
    - manual control of the EC fans
    - automatic control of the EC fans (for pressure or air quality)
    - water valve control
    - electric heater management
    - recovery unit defrosting management
    - free-cooling management (by stopping the rotor)
    - mixing/exhaust chamber management
    - post-ventilation
    - weekly programming
    - alarm management
    - remote on/off
    - Remote summer/Winter
    - timed activation via presence sensor
    - fan management via fire alarm digital input
    - BMS via Modbus protocol and RS485 connection 


(1) outdoor air/inlet circuit (2) at nominal airflow, inlet air temperature 15°, in/out water temperature 70/60°C (3) at nominal airflow, inlet air 28°C 60% RH, in/out water temperature 7/12°C (4) air inlet 29°C 65% RH, in/out cold water temperature 7/12°C, in/out

Two configurations of air flows are possible, one "right" and one "left" both referring to the view of the electrical panel:

With reference to the nominal operating conditions, the following table shows the sound power values (SWL) in octave and total bands. The sound pressure levels (SPL) at 1m, 5m and 10m in supply, return and outside the unit are indicated.