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The legally required thermal insulation measures (e.g. EnEV) lead to increasingly tight building envelopes, which largely prevent climatic exchange through diffusion between the interior and exterior.
Sophisticated and effective ventilation systems are therefore extremely important in creating a climate that is as natural as possible and that supports health, even in energy-efficient buildings. Gretsch-Unitas group offers you individual solutions for convenient, everyday room ventilation with Tilt-Only or Top-Hung sashes in pitched, triangular, round or segmental arch windows, outward or inward-opening.