Surface Closer Norton Surface Closers provide smooth constant control of the door through its full opening and closing cycle. Norton offers a complete range of surface closers designed to meet virtually any application demand. Light DutyLight duty door closers are typically used on interior or exterior doors that have low to moderate traffic/usage. Medium DutyMedium duty door closers are typically used on interior or exterior doors that experience moderate to high traffic/usage. Heavy DutyHeavy duty door closers should be used on interior or exterior doors that are subject to high traffic/usage.