Millennium Home Design’s ThermaFlect vinyl casement windows can be installed as a single standing window, or paired with an additional casement to create a twin structure. Casement windows “crank-open” from the inside, swinging towards the outside and can be hinged on either the left side or right side. The ThermaFlect casement window is airtight with a multi-point locking system that comes standard. The sleek, beveled edge design is aesthetically pleasing and allows for better peripheral vision from the inside looking out. Our casement widows are engineered with heavy-duty hardware that allows the window to open up to a full 90 degrees.