Abstract: A waste screen for roof drainage outlet located substantially in the plane of the roof consists of an outlet opening in the roof and a plate covering the opening having a circumference and vertical distance from the roof plane so that at least at dimensioning flow amount air is prevented from being sucked in beneath the plate edge and the gap between the plate and roof plane constitutes the outlet port. The water on its passage from the pitch to the outlet opening always passes through the outlet port, which ensures that in dimensioning cases the outlet opening and subsequent pipe are entirely filled with water. A screen extends about the circumference of the plate (4) and comprises a screen wall (7), which extends from the roof plane (1) to a plane above the plane through the circumference (circumferential edge) of the plate (4).

Abstract: A method and arrangement for air conditioning completely or partly a locality in a building, where the construction of the building comprises elements of e.g. concrete having parallel channels through which air is passed. The used air is ventilated from the locality after this air has been heated by machines, electric lights, e.g. and people within the locality and heat exchangers having greater masses and in which the accumulating effect can be used. Comprise parts of the building which operate as regenerative heat exchangers. Used air is passed from the locality with a given temperature through channels (2) in elements (3) of the construction, whereby heat is transmitted to the elements, whereafter the air is passed out to the ambient environment. Fresh air is passed in the opposite direction from the ambient environment into the locality through the channels and these two phases are repeated regularly and regulated during 24-hour periods.