The all-new Guardian Securistay is a window restrictor that provides ventilation for at-home security. Designed for use with projected timber top-hung windows, the Guardian Securistay limits the sash opening to less than 100mm, in accordance with NZ BC Acceptable Solution F4/AS1. As a security feature, the restrictor can only be released when the window is fully shut, this is easy to do using the release tool provided. The restrictor automatically re-engages when the window is closed again.