VESDA provides the discreet detection required in heritage buildings by routing the sampling pipes in areas that are not visible from normal occupancy. Small-bore capillary pipes are used to provide detection at the required location. The room fabric often dictates the location of these capillary tubes. Hiding the capillary tubes behind light fittings, blending in with ceiling paintings, or forming part of the ceiling sculptures can all be used to provide ‘invisible’ smoke detection.