The invention is a sill pan system that can be targeted for commercial and/or multi-family use and that works with ADA compliant thresholds. Specifically, the sill pan system includes a left end segment that is configured to fit in the bottom left corner of a framed-in door opening. The system also includes a right end segment that is configured to fit in the bottom right corner of a framed-in door opening. The left and right end segments are joined together at single seam. The top face of the sill pan is sloped to ensure that water and moisture is routed from the interior side of a building.

A sill arrangement for a fenestration frame includes a sill with a first chamber, a second chamber, a third chamber, and a fourth chamber. The sill includes a first internal wall that separates the first chamber from the second chamber. The sill arrangement also includes a corner key with a first port defining a first passage between the first and second chambers and a second passage between the second and third chambers of the sill. Moreover, a second port is included on the sill-facing surface that defines a third passage between the third and fourth chambers for allowing fluid to flow from the third chamber to the fourth chamber. The corner key further includes a drain in communication with the fourth chamber.

A sill arrangement for a fenestration frame includes a sill with a first chamber, a second chamber, a third chamber, and a fourth chamber. The sill includes a first internal wall that separates the first chamber from the second chamber. The sill arrangement also includes a corner key with a first port defining a first passage between the first and second chambers and a second passage between the second and third chambers of the sill. Moreover, a second port is included on the sill-facing surface that defines a third passage between the third and fourth chambers for allowing fluid to flow from the third chamber to the fourth chamber. The corner key further includes a drain in communication with the fourth chamber.