i. a first end;

ii. a second end opposite the first end;

iii. a top surface positioned on a top side of the louver and between outer edges of the louver;

iv. a bottom surface positioned between the outer edges of the louver and on a bottom side of the louver opposite the top side;

v. an end cap positioned at a lateral edge of the louver, the end cap comprising a top lip extending along the top surface and a bottom lip extending along the bottom surface, the end cap further comprising a flange extending generally transverse to the bottom surface and extending past the bottom surface in a direction away from both the top surface and the bottom surface so as to direct liquid flow from the top surface past the bottom surface to form droplets or streams to fall from a lower part of the flange and prevent travel of the liquid flow along the bottom surface, the flange extending from opposite edges of the bottom lip toward the outer edges of the louver, wherein the end cap further comprises a set of stacking bosses extending downwardly to facilitate stacking atop another instance of the end cap; and

vi. a leg having a proximal portion and a distal portion, the leg extending generally transverse to the second end and from the proximal portion to the distal portion wherein, in the closed position, a first louver and a second louver of the plurality of louvers are engaged with one another such that the leg of the second louver is received against the first louver.