Channel rectangular 20x25cm. for drains on roofs, to rainwater, with downpipe
Drawing labels, details, and other text information extracted from the CAD file (Translated from Spanish):
Rainwater drain, Channel in galvanized iron, Base support made of bolted wall plate, wall, ceiling, Ceilings on sheets isotex similar, clamp, elbows, Metal beam, Discharge of rainwater by downpour, End flange, Dropper