Which window type has an upper and lower sash that slide vertically in the side jambs?

Which window type has an upper and lower sash that slide vertically in the side jambs?

• A. Casement
• B. Double-hung
• C. Slider
• D. Fixed

Answer: (B)

Window types are defined by how the sashes move. A window that has an upper and a lower sash that slide vertically in the side jambs is a double-hung window. Both sashes travel up and down along tracks, allowing ventilation from the top, the bottom, or both. Casement windows hinge on one side and swing open, not slide vertically. Sliders move their sash horizontally, not up and down. Fixed windows have no operable sash at all. So the vertical two-sash arrangement specifically identifies the double-hung type.

Window types are defined by how the sashes move. A window that has an upper and a lower sash that slide vertically in the side jambs is a double-hung window. Both sashes travel up and down along tracks, allowing ventilation from the top, the bottom, or both. Casement windows hinge on one side and swing open, not slide vertically. Sliders move their sash horizontally, not up and down. Fixed windows have no operable sash at all. So the vertical two-sash arrangement specifically identifies the double-hung type.