Double Hung Window Stop

A home owner from Virginia says:
I want to limit the lower window from opening a certain distance e.g. 6". Which one of your devices should I use and where do I find the instructions. Not terribly handy.
Thank you
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Emily from SWISCO responded:

Hi there!

Take a look at our 26-387 vent latch kit along with the installation video below and see what you think. 

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