The Andersen double-hung window opening control device kit includes a right and left-hand device. The devices are installed on both sides of the sash and limit the opening of the venting sash to less than four inches when the sash is first opened. Release of the device allows the sash to be further opened for full sash ventilation and/or emergency escape and rescue. The opening control devices are automatically reset once the sash is returned to its fully closed position. The double-hung opening control devices meet requirements of ASTM F2090-08 and ASTM F2090-10 for Window Fall Prevention Devices With Emergency Escape and (Egress) Release Mechanisms. Always check with your local code official for all local code requirements and to determine if the minimum window sill height code has been adopted in your area and to determine if this device is accepted as an alternative to the minimum sill height requirement. Children are naturally curious and often want to explore what is on the other side of a window. As part of a window safety program: Look Out For Kids program in 1992 to teach both kids and adults the basics of window and patio door safety. Will Only Work With Andersen Brand Windows including: A-Series Double-Hung Windows, 200 Series Narroline Double-Hung, 400 Series Woodwright Double-Hung, 200 Series Tilt-Wash Double-Hung & 400 Series Tilt-Wash Double-Hung.