is possible in such windows without the use of trickle vents or overglass vents.

Single-hung sash

A single-hung sash window is a window that has one sash that is movable (usually the bottom one) and the other fixed. This is the earlier form of sliding sash window and is also cheaper.

Double-hung sash

A sash window is the traditional style of window in the United Kingdom, and many other places that were formerly colonized by the UK, with two parts (sashes)

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