Sandfields Aberavon Double Glazing. A family owned business that is the premier provider of home improvements including double glazed windows and doors in Aberavon and Sandfields. Welcome to MPN Windows, a family-owned business that aims to be the premier provider of home improvement services, producing quality double glazing in Aberavon and Sandfield. Whether you are looking to put the finishing touches to a dream property or are undergoing a complete refurbishment – or anything in between – we are at your service with a dedicated team of pro experts with almost three decades of experience in delivering the ‘wow’ factor on each and every project that we undertake in Port Talbot.