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The Siphonic Roof Drains use non-sloped, horizontal piping that takes up less space because it runs right below the roof for greater efficiency, as compared to gravity drains. This design allows for flexible vertical stack placement based on individual architectural needs. In this siphonic drain system, full-bore flow can occur with as little as two inches of water depth from the roof surface. Multiple drains can flow into a common horizontal collector pipe. This pipe turns downward into a vertical downpipe and transitions to conventional gravity drainage at a location to suit the design criteria of site expectations.
