Abstract: A skylight with improved thermal insulation includes a light tube which passes through a roof to bring daylight inside a building. The skylight conserves heat energy by providing a transparent, double paned insulation double glazing unit, which is positioned to divide the light tube into an upper tube and a lower tube. Insulation efficiency is maximized by providing the insulation double glazing unit, as well as an insulating foam collar the insulation unit is surrounded by and anchored to, in the same plane as the insulation in the ceiling of the building. The collar has a shape and thickness to match the span of ceiling or roof thermal insulation.

Abstract: A skylight with thermal insulation has an input part with light collector and an upper tube for roof passage. A lower tube with a diffuser is included and the roof passage contains an insulation double glazing unit which fixed directly into a collar made of foam insulation. It is especially advantageous if the insulation double glazing unit is fixed in the collar made of a foam insulation material including at least one plastic anchoring holder that embraces the double glazing unit perimeter and extends, with at least some of its parts, above and below the insulation double glazing unit and projects laterally toward the perimeter of the collar made of the foam insulation material.

Abstract: An aircraft which includes elements providing air circulation and directing the circulation along a housing. Different operational stages of the aircraft such as take off and level flight are achieved by using the same functionally inter-connected elements. The circulation is achieved by fan elements that allow adjusting the blow direction and the blowing force of the flow. A stagnation point (SP) associated with the circulation is also formed if necessary below the housing and the aircraft can be steered by controlling the circulation and the position of the stagnation point (SP).