A vertical mullion allows you to have one screen on larger window openings. The mullion can either be colour matched to the frame or black to suit the infill. The mullion can be in any position you like.
Guardian: Fixed Window Options
Cross Brace
A horizontal cross brace allows you to have one screen on larger window openings. Choose between black to suit the infill or colour matched to the frame. The cross brace can be in any position you like.