On which wall thicknesses can concealed HRV systems be installed?
Flow40 concealed HRVs require a perimeter wall with a minimum thickness of 335mm. Flow70 and Flow100 systems require perimeter walls with a minimum thickness of 460mm.
The product mentioned in this FAQ
Flow40
The most compact concealed HRV system. With humidity sensor as standard.
Go to product sheetCertified quality and performance
The performance of the Helty ventilation systems are recognized by the Casa Clima Quality Seal and have obtained the SIMA and BioSafe validations
