Fenster Aluminium Windows and Doors. Branches in JHB +27 (0) 11 796 5165 and CT +27 (0) 21 510 0921 . Fenster is a European-based company which manufactures aluminium doors and aluminium windows of the highest standard, using the best components and accessories available from Europe. With its recent introduction to the South Africa market, customers now have access to high-quality aluminium doors and windows that can not only reduce energy consumption, but improve the ambient comfort of any home or office environment. Custom-made to meet individual tastes and architecture, Fenster’s products are styled on contemporary European design and cater for both single- and double-glazed designs. You can find us on www.fenster.co.za or contact us from the website contact form.