Brilliant White Sash Windows Give a Classic Look to Your South Wales Property. Sliding sash windows are extremely effective as ventilation points for all South Wales homes with limited space. This is because they slide up and down instead of swinging inward and outward. Bringing more of your attention, they are quite essential if you want to keep up the heritage appearance of your property and available in white giving the appearance of old style painted sash sliders mock in modern upvc Veka frames profiles and sills from your leading supplying fabricator MPN Windows Fensa registered approved company.