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A window includes a weather seal system that employs two seals. The first seal is located towards an exterior surface of the window and forms an air-permeable water barrier between an active sash and a sill. The second seal is located towards an interior surface of the window and forms a substantial

A window includes a weather seal system that employs two seals. The first seal is located towards an exterior surface of the window and forms an air-permeable water barrier between an active sash and a sill. The second seal is located towards an interior surface of the window and forms a substantially air-impermeable and water-impermeable barrier between the active sash and the sill.

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1. A window for reducing moisture entry due to pressure differentials, the window having an interior side for facing toward an interior of a structure in which the window is installed and an exterior side for facing toward an exterior of a structure in which the window is installed, the window compr

1. A window for reducing moisture entry due to pressure differentials, the window having an interior side for facing toward an interior of a structure in which the window is installed and an exterior side for facing toward an exterior of a structure in which the window is installed, the window comprising: a window frame including a first jamb, a second jamb, a header, and a sill, the sill defining a bottom surface for placement on or adjacent a bottom frame member of a rough opening and defining a maximum sill height as measured from the bottom surface of the sill to a top surface of the sill, the sill forming a transition channel at least partially defined by a front surface, a bottom surface, and a back surface, wherein the bottom surface includes a sloped portion that slopes downwardly towards the front surface, and wherein the front surface is configured to transmit moisture out of the channel;an active sash that is moveable with respect to the window frame between an open position and a closed position, the active sash having a first side, a second side, a top, and a bottom;a primary sill seal configured to contact the sill and the sash when the sash is in the closed position to form a substantially water-proof and substantially air-tight seal; anda secondary sill seal configured to contact the sill and the sash when the sash is in the closed position to form an air-permeable water barrier, the primary sill seal and the secondary sill seal being arranged about the transition channel such that the transition channel exhibits a pressure substantially corresponding to an exterior of a structure in which the window is installed even when an interior of the structure and the exterior of the structure exhibit a pressure differential. 2. The window of claim 1, wherein the maximum sill height is 1.75 inches or less and the window meets PG-100 per NAFS 101/I.S.2/A440-11 and ASTM E547. 3. The window of claim 1, wherein the primary sill seal is adapted to contact the back surface of the channel and a bottom surface of the active sash when the active sash is in the closed position. 4. The window of claim 3, wherein the primary sill seal is configured to form the substantially water-proof and substantially air-tight seal when the bottom surface of the active sash is less than or at 1.25 inches from the back surface of the channel. 5. The window of claim 3, wherein the secondary sill seal is adapted to contact the front surface of the channel and an exterior surface of the active sash when the active sash is in the closed position with respect to the sill. 6. The window of claim 1, wherein the sill forms a water pathway configured to receive moisture from the transition channel and to convey the moisture out of the transition channel to the exterior of the structure. 7. The window of claim 1, wherein the sloped portion of the bottom surface of the transition channel includes all of the bottom surface of the transition channel. 8. The window of claim 1, wherein the secondary sill seal is a rain screen. 9. The window of claim 1, wherein secondary sill seal is configured to contact the first side of the sash and the sill and when the sash is in the closed position. 10. A window for reducing moisture entry due to pressure differentials, the window having an interior side for facing toward an interior of a structure in which the window is installed and an exterior side for facing toward an exterior of a structure in which the window is installed, the window comprising: a window frame including a first jamb, a second jamb, a header, and a sill, the sill defining a bottom surface for placement on or adjacent a bottom frame member of a rough opening and defining a maximum sill height as measured from the bottom surface of the sill to a top surface of the sill, the sill forming a transition channel at least partially defined by a front surface, a bottom surface, and a back surface, wherein the bottom surface includes a sloped portion that slopes downwardly towards the front surface, and wherein the front surface is configured to transmit moisture out of the channel;an active sash that is moveable with respect to the window frame between an open position and a closed position, the active sash having a first side, a second side, a top, and a bottom;a primary sill seal configured to contact the sill and the sash when the sash is in the closed position to form a substantially water-proof and substantially air-tight seal; anda secondary sill seal configured to contact the sill and the sash when the sash is in the closed position to form an air-permeable water barrier, the primary sill seal and the secondary sill seal being arranged about the transition channel such that the transition channel exhibits a pressure substantially corresponding to an exterior of a structure in which the window is installed even when an interior of the structure and the exterior of the structure exhibit a pressure differential, wherein, when the sash is in the closed position with respect to the sill, the secondary sill seal contacts the front surface of the transition channel at a contact point that is closer to the active sash than a contact point between the primary sill seal and the back surface of the transition channel. 11. A window for reducing moisture entry due to pressure differentials, the window having an interior side for facing toward an interior of a structure in which the window is installed and an exterior side for facing toward an exterior of a structure in which the window is installed, the window comprising: a window frame including a first jamb, a second jamb, a header, and a sill, the sill defining a bottom surface for placement on or adjacent a bottom frame member of a rough opening and defining a maximum sill height as measured from the bottom surface of the sill to a top surface of the sill, the sill forming a transition channel at least partially defined by a front surface, a bottom surface, and a back surface, wherein the bottom surface includes a sloped portion that slopes downwardly towards the front surface, and wherein the front surface is configured to transmit moisture out of the channel;an active sash that is moveable with respect to the window frame between an open position and a closed position, the active sash having a first side, a second side, a top, and a bottom;a primary sill seal configured to contact the sill and the sash when the sash is in the closed position to form a substantially water-proof and substantially air-tight seal; anda secondary sill seal configured to contact the sill and the sash when the sash is in the closed position to form an air-permeable water barrier, the primary sill seal and the secondary sill seal being arranged about the transition channel such that the transition channel exhibits a pressure substantially corresponding to an exterior of a structure in which the window is installed even when an interior of the structure and the exterior of the structure exhibit a pressure differential, wherein the first jamb defines an first surface and the active sash defines a first side, the window further comprising:a primary jamb seal configured to contact the first surface of the first jamb and the first side of the active sash to form a substantially water-proof and substantially air-tight seal; anda secondary jamb seal configured to contact the first surface of the first jamb and the first side of the active sash to form an air-permeable water barrier,the primary jamb seal, the secondary jamb seal, the first side of the active sash, and the first surface of the first jamb defining a drain cavity in fluid communication with the transition channel of the sill and configured such that the drain cavity exhibits a pressure substantially corresponding to an exterior of a structure in which the window is installed even when an interior of the structure and the exterior of the structure exhibit a pressure differential. 12. The window of claim 11, wherein the primary jamb seal and the primary sill seal are unitarily formed of a single material. 13. A method of forming a window, the method comprising: coupling a sash to a window frame with a sill, the sash moveably coupled to the window frame, the sill having a first chamber in a first portion of the sill, the first chamber defined by a front side and a back side;attaching a first material to a bottom surface of the sash, the first material configured to form a substantially water-proof and substantially air-tight seal with the sash near the back side of the first chamber when the sash is in a closed position with respect to the sill;attaching a second material to the sash, the second material configured to form an air-permeable water barrier between the sash and the sill near the front side of the first chamber when the sash is in the closed position; andattaching a third material to the sash, the third material configured to form an air-permeable water barrier between the sash and the sill near an interior facing side of the window when the sash is in the closed position. 14. The method of claim 13, wherein the first chamber is configured to maintain a level of accumulated moisture below a contact point between the first material and the first surface of the sill.