This lathe plate is designed to be used to assist rendering around a 100mm diameter penetration in a wall air inlet to any of the acoustic ventilators. It is designed for use on the exterior wall. The lathe plate is designed to be used in conjunction with any of the 100mm diameter exterior weather louvres. It is intended for use where the Silenceair ventilator is connected to the outside via a flexible duct. The lathe plate comes in either a 5mm version for use with skim coats, such as on HEBEL panels, or a 12mm version for use with cement render.