GRS 45÷340

Heat recovery unit from 450 to 3.400 m³/h with HIGH EFFICIENCY exchanger

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Ventilation unit designed and manufactured for non-residential applications, it allows combining the need for air renewal with energy-saving and maximum flexibility and versatility of installation, thanks to the 90° adjustable air inlets with the movement of the closing panels. Equipped with a heat recovery unit in aluminium plates, fans with EC motors and integrated motorised by-pass system for free-cooling operation. The series, equipped with an easy kit for vertical installation, is divided into seven sizes, for air flow rates ranging from 450 to 3,500 m³/h.


  • GRS/DX - Right configuration
  • GRS/SX - Left configuration


  • The structure is made with 22 mm thick insulated panels in galvanised sheet metal on the inside and RAL 9002 pre-painted finish on the outside, internally insulated with non-flammable mineral wool thermal-acoustic insulation.
  • Compact filters with synthetic media (external layer) and glass fibre media (internal layer) and galvanised steel frame, in the efficiency class ePM10 50% on the ambient air intake and ePM1 50% on the outdoor air intake, removable on the bottom. Each filtering station is already equipped with a control pressure switch wired on board and suitable to house two filters in sequence.
  • EC Inverter Plug-Fans.
  • High-efficiency static heat recovery unit of the air-to-air type with counterflow with aluminium exchange plates equipped with additional sealing, integrated with a by-pass system already motorised for free-cooling operation; condensate collection tank in aluminium, with 1/2" F double bottom drain.
  • Pre-heating electrical heater predisposition.
  • Post-heating electrical heater or water coil predisposition.
  • Electrical board built-in in the unit with electronic adjustment and remote user interface for complete control of all features: ventilation and temperature control, filter status monitoring, weekly programming, defrost and antifreeze management, fire alarm management and Modbus interface.

Factory fitted accessories

  • FTF9 Plate filters efficiency F9 ePM1 85% - Second stage
  • PF4 External air pre filter
  • BCC Nozzle for circular ducts
  • SK Adjustment damper
  • GA Anti-vibrating joint
  • AT Constant air flow regulation control
  • WB Water cooling / heating coil
  • EHP Supplementary electrical heater-PRE
  • EHR Supplementary electrical heater-POST

Loose accessories

  • CRT Touch screen remote control panel
  • KTV Vertical installation conversion kit
  • SQO Air quality sensor (CO2)
  • KSA Sanitization module with UVC plasma and antivirus
  • V33 3-way modulating valve with servo control
Air flowNominalm³/h45080013001700210026003400
Electrical characteristicsPower supplyV/Ph/Hz230/1/50230/1/50230/1/50230/1/50400/3+N/50400/3+N/50400/3+N/50
Max. running currentA2,82,96,06,06,73,43,5
Motors nominal powerkW0,300,340,780,921,251,501,60
Heat RecoveryRecovery efficiency (1)%87,085,989,789,786,489,689,5
Recovery capacity (1)kW4,177,3216,2516,2519,7425,0232,70
Recovery efficiency (2)%76,175,176,377,276,277,377,2
Heating capacity (3)kW2,854,987,8610,3811,9816,7921,08
Water flow (4)l/s37566511201475169523752770
Electrical HeaterPowerkW1,52,54,05,05,07,510,5
Power supplyV/Ph/Hz230/1/50230/1/50230/1/50230/1/50230/1/50400/3+N/50400/3+N/50
WeightsTransport weightkg103129202227232302339
Operating weightkg90115185210215275310




  • 1 Under humid conditions at nominal flow rate: outdoor air at - 10 °C 90% RH, ambient air at 22 °C 50% RH.
  • 2 In condizioni secche alla portata nominale: aria esterna a 5° C, aria ambiente a 25° C
  • 3 Alla portata nominale: aria in ingresso a 15° C, acqua in/out a 45°/40° C
  • 4 Alla portata nominale: aria in ingresso a 28° C 60% UR, acqua in/out a 7°/12° C