Revisions log for Answer #2906

At the normal 2.01 x 2.135 size, a design without a center mullion is standard; so I think your supplier's concerns are exaggerated. Only at a window size of 1.135 per sash – because of the weight of a triple glazed window – forend is not the worst solution; as long as laminated safety glass comes into play, of course. A window of this size will survive the warranty period without a faceplate, but after that.