Pollen filter F7The unit is supplied as standard with a G4 filter.If persons in the dwelling suffer from a pollen allergy, there is an option formounting a F7 pollen filter in the outdoor air inlet to minimise the pollen in theindoor air.Water trapTo ensure that the condensate can drain off freely, a water trap must beestablished.The water trap must be regularly checked for water. In the summer season,where no condensation will occur, there is a risk of the water trap drying out. TheNilan water trap contains a ball which cease to prevent "false" air intake into theunit, so that condensate can run freely out of the unit.Vibration absorbers4 pc. of vibration absorbers are placed under the unit and secure an effectivedimming of the vibrations of the unit againt the surface.Flexible silencingTo facilitate later servicing of the unit, we recommend fitting a flexibleconnection between the unit and the duct system.Nilan's sound damping flexi-hose gives good sound damping both to the ductsystem and to roof stacks.CO2 sensorFitting a CO2 sensor means the ventilation speed can be pre-programmed to runhigher ventilation levels in the event of high CO2 level in the extracted air. CO2levels can be programmed.Installation of the CO2 sensor must ordered from the factory.10