This function allows the geometric input of a partial surface.
(rectangle, triangle, trapezoid, circle/sector/segment).
The partial surface is subtracted from the selected component or
and included in the energy certificate calculation.
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If only "Subtraction surface" is activated, there is no change of area and volume. It serves, for example, as a way to connect adjacent temperature situations, or to take into account different component structures. Subtraction surface - is calculated as a partial area of the total area.
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If "Subtraction surface" and "with volume" is activated: a) the floor will be decreased b) the volume will be decreased
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If only "Volume" is activated: a) the floor will be enlarged b) the volume will be enlarged
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