Designed to fit Simontron Brickmould 300 double hung windows

Allows you to keep the window cracked open, with the appearance of being closed from the outside

Great for listening to the rain, without getting the windowsill or anything inside wet

Allows for cooling your house without a breeze or draft since the airflow is directed upwards, not across your room.

This is made of PETG plastic with 40% infill so it is supper strong and won't warp in direct sunlight.

Choose Orange, so it's visible to you and you won't forget it's in the window, or a more neutral color to blend in. All colors feature a locking tab to prevent it from being pushed out.