Managing condensation with fluid control film apparatus

A condensation management apparatus, comprising:

• a microstructured film arranged to condense water vapor on an underside of a substantially horizontal surface, the microstructured film comprising:
• channels disposed at least on a first major surface of the film and configured to support capillary movement of condensate, the channels having a channel axis substantially parallel with a longitudinal axis of the film;
• and
• a plurality of capillary siphon structures comprising:
• a first fold in the film;
• a second fold in the film;
• a condensate collection region between the first and second folds;
• a first siphon region between the first fold and a first condensate release location of the film;
• and
• a second siphon region between the second fold and a second condensate release location of the film;
• and
• at least a portion of a second major surface of the film attached to the underside of the substantially horizontal surface such that longitudinal openings of the channels of the condensate collection region are oriented towards a direction of gravity and the first and second condensate release locations are positioned lower along the direction of gravity than the condensate collection region to support siphon action of the capillary siphon structures.