6 Door frames, casings, panels, rollers, runners, stops, and complete door units made of metal; Windows casements, frames, shutters, sills, and complete window units made of metal
19 Door frames, casings, panels, rollers, runners, stops, and complete door units not made of metal; Windows casements, frames, shutters, sills, and complete window units not made of metal
20 Frames made of Wood, Components made of wood, wood components and plastic