Ventilation chimneys are made of PVC boards resistant to weather conditions (including UV rays), in lengths of 1,2 m and, if appropriate, connected together in suitable proportions. Every chimney is rain protection ended, for example deflector or visor. Sealing plate, assembled on the roof, is adapted to the type of roof (flat, wave or trapezoid plate). From the bottom the chimney is finished with an air-flow ring.
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