High performance fenestration system

A fenestration system, comprising:

• an insulated infill panel;
• a sash surrounding the insulated infill panel and including a sash member;
• a fenestration frame member longitudinally adjacent with the sash member, the sash operable with respect to the fenestration frame member;
• the sash member and the fenestration frame member each including a respective interior-facing portion facing a protected environment, a respective exterior-facing portion facing an unprotected environment, and a thermally insulating material fixedly joining the respective interior-facing portion and the respective exterior-facing portion to form a unified structure and the thermally insulating material defining a thermal break therebetween;
• the sash member includes a first pair of directly projected integral portions and the fenestration frame member includes a second pair of directly projected integral portions;
• a pressure chamber positioned entirely on one side of the thermal break and formed by overlapping the first pair of directly projected integral portions and the second pair of directly projected integral portions.

A fenestration system, comprising:

• an insulated infill panel;
• a sash surrounding the insulated infill panel and including a sash member;
• a fenestration frame member longitudinally adjacent with the sash member, the sash operable with respect to the fenestration frame member;
• the sash member and the fenestration frame member each including a respective interior-facing portion facing a protected environment, a respective exterior-facing portion facing an unprotected environment, and a thermally insulating material fixedly joining the respective interior-facing portion and the respective exterior-facing portion to form a unified structure and the thermally insulating material defining a thermal break therebetween;
• the sash member includes a first sash projection and a second sash projection, each projecting directly and integrally from the sash, the first sash projection being shorter lengthwise than the second sash projection;
• the fenestration frame member includes a first frame projection and a second frame projection, each projecting directly and integrally from the fenestration frame member;
• a pressure chamber positioned entirely on one side of the thermal break and formed by overlapping the first frame projection with the first sash projection and the second frame projection with the second sash projection forming the inner most boundary of the pressure chamber.