Shutter

The shutter in the internal housing of the PP 45 serves to prevent unpleasant smells/harmful substances from being drawn into interior rooms and/or cold outside air flowing in when the unit is switched off (level 0).

On PP 45 O units, the shutter is opened or closed by hand. Shutter open (vertical): Turn rotary knob all the way to the right. Shutter closed (horizontal): Turn rotary knob all the way to the left.
With PP 45 K and PP 45 RC units, the shutter opens and closes automatically (servomotor).
PPB 30 units do not have a shutter.

Before switching on PP 45 O units, ensure that all shutters are fully opened. This is the only way of ensuring perfect ventilation and air extraction.