As the name suggests, horizontal sliders open by sliding the sash to the left or right. Horizontal sliders are available as single or double sliders. Single sliders allow for one sash to be opened, while double sliders allow for both to be opened simultaneously for maximum ventilation.

Because they open to the side, and not outward, horizontal sliders are a popular choice for rooms that face porches or patios. The wide design and flat profile of horizontal sliders allows them to add a contemporary touch to any room, and let in large amounts of light without compromising space in smaller rooms.