For the HVR systems to operate, they require at least one dedicated louvre on the external façade that would be connected to each HVR system. The louvre should generally match the overall size of the HVR system it is connecting to, however there is flexibility to also utilise alternative size louvre.
It is recommended that a louvre size of 900mm(w) x 300mm(h) is utilised. Should a different sized louvre be required, a minimum louvre area of 0.27m² should be achieved.
Where additional natural ventilation louvres are being utilized within a room which has HVR systems assigned, there is no minimum or maximum sizes required. These can be sized to match other elements within the external façade of room.
