In certain situations it becomes necessary to add a safety grill to the window cavity. It could be for security purpose or for prevention of accidents. There are many design options available that can be adapted to the type of window being installed.
is an option that can be considered where the sill width is restricted. The grill can be added on the outside, flushed with the external wall, for windows that open on the inside or for slider windows. They can also be fitted on the inside for windows opening outwards.
can also be prefabricated and sandwiched between double frames where windows need to be opened outwards and inwards, for example to accommodate mesh windows.