WPC Door Frame 217mm for Wide and Double Door Openings Wide and double door openings put the frame under a longer span, and that is where timber starts to bow. This 217mm WPC door frame is resistant to cracking, splitting, warping or deformation, so the head and jamb lines stay true across the full opening and the door leaf keeps an even gap. The natural wood colour is available in smooth or embossed wood grain, and the profile nails like wood, which keeps installation