The Pella 3040 windows double hung are high-quality vinyl windows that are easy to install and durable. With a lifetime manufacturer warranty, these white windows are designed for double-hung window systems and have a rough opening size of 35-11/2" x 47-1/3". The unit is 36 inches wide and 4 feet long, making it suitable for various home improvement projects. Built by Pella, a reputable brand known for making stylish and reliable windows, these double-hung windows are a great addition to any home or garden space.