Which statement concerning types of sash and sash components is NOT CORRECT?

The statement that all sash components are identical across different types of windows is not correct. In actuality, sash components can vary significantly depending on the type of window design and its specific functionalities. For example, a double-hung window will have different components than a casement window, reflecting their unique operational mechanics and stylistic elements. This variability in design is crucial for meeting different aesthetic requirements, functional needs, and performance standards such as energy efficiency, ease of use, and maintenance considerations.

Other options are accurate reflections of sash terminology and design principles: blind stops do indeed generally appear adjacent to the bottom rails of a lower sash in double-hung configurations; double-hung sash facilitates ventilation from both the top and bottom, allowing for effective air circulation; and various sash components are specifically designed to improve thermal performance, which is increasingly important in modern building practices for energy conservation.