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Flat roof vents

New: alwitra vent stackWastewater downpipes in the building serving as vent lines must protrude over the roof. The alwitra vent stack forms the upper end of vent lines protruding over low slope roofs with waterproofing of any constructional type up to DN 125 (OD 125).The vent stack consisting of one single pipe extends over the […]

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