Our Mirror TVs can be mounted on a chimney breast provided there is adequate ventilation. If they are surface mounted (i.e. not recessed) then the free air surrounding the TV will provide sufficient circulation.If you are recessing the unit into the chimney breast then ventilation is required by either employing a forced air system (fans) or providing a suitable void to increase the volume of air for circulation - please see question 5 below. MirrorMedia can provide suitable fan kits and further information on installation.