Air for the Drainage System: Limiting Roof Penetrations in Tall Buildings

Steve White
Technical Director DWV
Aliaxis, London

A building cannot function without a drainage system; it is a fundamental requirement, removing drainage waste and protecting the occupants from gases and pathogens. The drainage system requires air to balance the pressures, preventing the traps from being depleted. The method of bringing air into the system directly impacts the architecture of a building, providing a challenge for MEP design engineers to find ways to bring in air without compromising the design. Bringing air into the drainage system has traditionally been achieved by the use of vent pipes running throughout, to the top of, and protruding out of the top of the building. This especially affects tall buildings where, for health and aesthetic reasons, the large number of these unsightly pipes cannot be located near rooftop pools, podiums, or AHUs. To meet the architectural design of a building, MEPs often seek a solution to limit the roof penetrations by using linked vents and side venting. This presentation addressed the limitations of these methods and provided a solution using active drainage ventilation, which allows a building to fully function with limited drainage vents to the atmosphere and removes any limitation on architectural design.

Accompanying PowerPoint Presentation

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