Fiberglass Fixed windows are stationary units (they do not open). They`re great for letting in light and exposing views, but provide no ventilation. Fiberglass Fixed windows look good by themselves or in combination with other window styles such as the 500 double hung tilt window. Fibertec windows provide one of the narrowest sight lines, thus giving you more glass area. Fibertec Window & Door Mfg. carries the most extensive glass options available catering to extreme weather climates. Fibertec has developed a fiberglass window system featuring advanced technology, resulting in one of the world`s best energy-rated systems that is environmentally friendly and is used in sustainable building.Once installed in your home, Fibertec windows will never warp, twist, rot, shrink, or dent.