sash stop

sash stop

A small strip nailed or screwed around a cased frame to hold a sash (of a double-hung window) in place; also called a window stop.
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Another option is a surface 'rail' lock, and if you need some ventilation, have a sash stop screwed onto the frame.
Sash stops allow the window to be opened slightly for ventilation (or opened fully with a key), but not enough for someone to get in, providing they're fitted at the right height, so they're a good security measure.
Sash stops allow the window to be opened slightly for ventilation (or opened fully with a key), but not enough for someone to get in (providing they're fitted at the right height), so they're a good security measure.
timers on appliances and operable windows with sash stops, allow residents to safely direct their activity and take personal responsibility for activities of daily living.
To allow windows to be partially opened for ventilation but without compromising security, sash stops a reideal.