To enhance safety and security, many HDB flat owners opt to install grilles alongside their windows. Customers can choose between fixed or sliding grilles based on their preferences and needs. Aluminum grilles, specifically, require minimal maintenance, boast high durability, and can withstand Singapore’s diverse weather conditions. For those looking for a more discreet option, invisible grilles provide a safety solution without obstructing the view, contributing to a cleaner and sleeker appearance for the windows.