Which items comprise the window system testing combinations?

• A. Interior window muntin and window sashes
• B. Casing, stops, jambs, and aprons
• C. Exterior window muntin and window sashes
• D. Window frame parts and weather seals

Answer: (B)

The window system is the fixed frame and trim that surround the movable sash and define the opening. The components that make up this system—casing (the decorative trim around the opening), stops (the parts that hold the sash in place), jambs (the vertical sides of the opening), and aprons (the horizontal trim below the window)—form the surrounding structure where lead paint is commonly found and where testing often targets as a unit. Looking at these together as a system helps inspectors assess potential lead hazards on all the surfaces that contribute to the window opening, not just individual parts like the sash or muntins.

Interior or exterior muntins and sash are parts of the moving or divided sections of the window, and while they can contain lead paint, they are not grouped with the surrounding frame that defines the window opening. Window frame parts and weather seals are related, but weather seals are not typically treated as part of the finishing trim around the opening in the same testing context, and the frame parts alone don’t capture the finished window opening’s trim and stops as a single testing set.