This Circular Soffit Ventilator (CSV) features evenly-spaced louvres to encourage the flow of air into a roof space, as well as insect screening to prevent insects and debris from coming in through the gaps. This circular louvred soffit board ventilator can be slotted into a brand-new soffit board before installation, or it can just as easily be retro-fitted into existing soffit boards. Unlike a standard ventilator, the circular soffit ventilator may be installed with its louvres facing outwards or inwards. Inward facing can give the impression of a continuous, unpenetrated soffit when a CSV of a matching colour is fitted. Available in multiple colours to blend seamlessly into your soffit board, including anthracite grey, white, black and brown. This circular soffit ventilator will require a 70mm hole.