Zehnder ComfoAir 155WM Heat recovery units for Apartment & Small Houses 400 100 086 Secure Window Kit for Unity Secure Window Kit for Unity CV2 PB4L Parts Bags are sold as a pack of four with a colour coded webbing strip to aid organisation as well as a see through mesh side panel so as you can view the contents The videos below explain the unit's commissioning and ongoing maintenance Zehnder ComfoAir 155WM GB (also know as Greenwood Vireo HR155WM) is the latest Heat Recovery Unit suitable for apartments and small houses compact wall mounted unit with capacity for properties up to 125m2 it can easily be installed in a kitchen cupboard