US Patent 11319747 Water management system for sill assemblies

An assembly for a door or window frame including an elongated sill and a corner key attached to each end of the sill. The corner key includes a water chamber for collecting water therein and a plurality of ports for diverting water from the water chamber outwardly through a drain port. The water chamber and plurality of ports are designed to temper a high-pressure gradient in the sill and effectively promote water egress away from the sill.