The manufacture of household, office, public building, professional and restaurant furniture and fixtures which are mainly made of wood or other materials other than metal. Included also in this group is the manufacture of upholstered furniture regardless of the material used in the frame; dual purpose sleep furniture such as studio couches, sofa beds and chair beds; mattresses and bedsprings; and window and door screens and shades. The production of furniture and fixtures which are made primarily of metal, is classified in group 3812 (Manufacture of furniture and fixtures primarily of metal); the moulding of plastic furniture is included in group 3560 (Manufacture of plastic products n.e.c.).