Few people have heard of flying mullion windows, but they remain a relatively popular choice, particularly for those who have good views. Flying mullion windows are also useful for those who would like a wide opening for escape in case of fire. These windows open in our out from the centre, but have no column in the middle. This allows for a larger opening and uninterrupted views. Flying mullion windows are available in aluminium, uPVC and timber versions, with each window being made-to-order based on the measurements and specification required.