The standard ventilation function, in the form of an inclined sash, does not always provide the required air inflow or outflow. If you open the window wide open, then a stronger wind blower than necessary is not ruled out. A do-it-yourself latch will help create the desired air flow in the room.
How to make a latch for a plastic window sash
We cut off a blank of the required length from an aluminum plate 2 cm wide.
On the edges of the workpiece along the midline, we mark the centers and drill holes, stepping back from one end 1 cm, with a diameter of 0.4 cm, and from the other – 1.5 cm and a diameter of 1.2 cm.
We fix the plate through a smaller hole to the inside of the window frame in the calculated place using a self-tapping screw with a round head, placing a suitable nut between the frame and the plate. We do not tighten the self-tapping screw completely so that the plate can freely rotate around the self-tapping screw, as on an axis of rotation.
We open the window sash and put the plate with a large hole on the locking pin, which protrudes from the sash frame and has a cylindrical shape. If the window needs to be closed, it is enough to throw off the locking plate from the trunnion and fix the window in the closed position using the handle.