| 摘要 |
A curtain wall drainage system for horizontal mullions comprising a flexible, conforming flap member disposed in flush engagement against a weep hole formed in the mullion. The flap permits egress of water infiltrated therein while preventing infusion of water or air turbulence within the mullion from wind loading against the curtain wall. An upper portion of the flap member secured to the outer weep hole surface for permitting pivotal movement therefrom and the passage of water through the weep hole and beneath the flap member. The flap member is constructed of sufficiently resilient and conforming material to permit the presence of a stream of water beneath the flap member from the weep hole to the lower end portion thereof and the creation of a capillary action therein for urging water contained within the mullion downwardly beneath the flap member for discharge from the curtain wall structure. In this manner, mullions may be drained of infiltrated water under conditions not normally faciltating mullion drainage and while preventing air turbulence within the glazing cavity during periods of wind loading.
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