Which items are included in window system testing combinations?

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Window system testing targets the components that form the fixed surround of the window opening—the parts that enclose and support the sash. Casings, stops, jambs, and aprons are the trim and framing pieces that make up this system, so they’re evaluated together to assess potential lead hazards across the surrounding surfaces. The movable sash and its muntins are part of the sash assembly rather than the fixed frame, so they belong to a different testing category. Weather seals are important for sealing gaps but aren’t the core components of the window system frame, so they’re not grouped with the system testing set. Therefore, the items that belong to window system testing combinations are casings, stops, jambs, and aprons.