Window's air flow (opening) precision regulator :)

This improvement to well known window regulator which lock it in partly opened position. This device mounts on existing regulator and allows much more narrow steps to keep window open, even at cold times, ensure that you have fresh air in the room but not getting cold.

Here is two versions, they differ only by form of "tooths" (one version is directional - which is useful if you have strong wind to the room, another have just standard form), you can select best that will suit your situation.

The device attaching on the existing regulator and click on it firmly. In case you have it weak, after you will decide the direction to mount, you may want to put some glue in to fix it permanently.

Enjoy fresh air and stay healthy!