A curtain wall for a building comprising: a frame anchored to the building and including a plurality of frame units; infill panels, which are supported by the frame units and at least partially define an outer face of the curtain wall; wherein the curtain wall comprises at least one drainage vent for venting fluid from inside the curtain wall to outside the curtain wall, the drainage vent comprising a fluid flow path, wherein an opening for the fluid flow path is provided in the outer face of the curtain wall.