How Double-Hung Windows Work - Visual Guide to Sash Movement #3075899 (License: Personal Use)

This diagram illustrates the dual-sash mechanism of a double-hung window: the upper sash slides downward within the outer frame (highlighted in green), and the lower sash slides upward (highlighted in red), with the fixed frame shown in blue. The design allows simultaneous opening at top and bottom for cross-ventilation, and each sash can be locked independently for safety. A central latch secures both sashes when closed.

Used on home improvement, window replacement, or HVAC education pages; targets homeowners researching window types, contractors explaining installation, or DIY users seeking ventilation solutions.