Profile: Subframes UK manufactures cavity closures, frame formers, and sub-frames. We provide cavity closures to suit all makes & types of windows, doors and window/door combinations using a wide variety of profiles. We also offer spectus window system. It allows the window to be fitted from either the inside or the outside. There is an optional head vent which also acts as a stabilizer during installation. It is an ISO 9001-2000 registered company.