Aluminium & UPVC Double Glazing in Cardiff from the leaders in South Wales for Cardiff MPN. When you choose MPN Windows, you are guaranteed value quality affordable double glazing. With over 25 years experience of supplying and installing double glazing in Cardiff, MPN Windows offers a wide range of stylish and energy efficient HQ double glazed windows and doors. Call/Text Cardiff double glazing to 07976 640 959 or call the free help phone number and order your new or replacement windows, doors and conservatory.