RJ Window's Parallel Windows are designed for maximum ventilation and ideal for staircases, landings and offices. With a maximum sash size of 2 meters (6.6 feet) wide and 2 meters (6.6 feet) tall it caters for large openings, giving plenty of light to the area. With a weight carrying capacity of 200kg per sash the glazing options are almost limitless. There is a facility to incorporate a security grill or blinds for security or privacy.