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Rain Water - Outlet
The purpose of roof outlets is to provide effective drainage of rainwater. Selection of roof outlets is usually the responsibility of the specifying engineer conversant with the roof construction, roofing finish, drainage system and designated function such as a garden or parking.
Rain Water - Outlet
https://www.roofingoutlet.co.uk/collections/flat-roof-rain-water-outlets
We have "waste terminal - area drain - AD" at the moment, which is a more general. We have used the term "outlet" for electrical items, so using "drain" would be appropriate in this case.
We also have active relate discussions in #343 and #306, @Danutzz182 can you please contribute to them?