WPC Door Frame 304mm for Main Entrance Openings The 304mm width is the deep reveal profile used on main entrance and exterior door openings, where a wide frame has to carry the door line and still close the wall gap. WPC door frames do not deteriorate and do not require maintenance: the wood plastic composite body does not absorb water, insects do not feed on it, and the surface stays flat through wet seasons instead of swelling and splitting like timber. The natural wood