The depth required depends on the TV and frame chosen. We recommend that a recess installation is carried out by a qualified installer - with the frame and TV on site to ensure the dimensions used relate to your frame and TV. If you would like further information, please contact us and we will be happy to provide you with a copy of our installation guide.In a stud wall, a void is required for air circulation; we recommend a void of 100mm in depth by 1m above and 1m below from the centre of the unit. If this circulation void is not possible - or if you are mounting the TV in a block or brick wall then we suggest a forced air ventilation system is employed with thermostatically controlled fans, which MirrorMedia can supply.