According to National Security Screen Association and our experience, security screen doors and window grilles include mesh (one-way vision, or fly-screens, or perforated, or X-Gard, or stainless steel mesh) and grilles in order to keep the insects out, allow the fresh air coming in the house, and to “withstand most attempts at forced entry”. https://www.allrollershutters.com.au/security-doors.php