15299 u window products are offered for sale by suppliers on Alibaba.com, of which casement windows accounts for 3%, others windows accounts for 2%, and sliding windows accounts for 1%.
A wide variety of u window options are available to you, such as free spare parts, onsite installation and onsite training.You can also choose from aluminum alloy, steel and wood u window,as well as from swing, folding, and slide u window, and whether u window is villa, hotel, or apartment.