An apparatus having a memory and a controller is disclosed. A first table contains a soot compensation factor, respectively, for each weight of oil selected among a predetermined range of oil weights. A male die includes housing-hole formation convex portions which are constituted by a plurality of first housing-hole formation convex portions having respective tip ends at a relatively-higher heightwise position, and a plurality of second housing-hole formation convex portions having respective tip ends at a relatively-lower heightwise position. The valve box further includes a lid that is positioned over the housing chamber opening. After generating polyhedral building models, prismatic building models can also be generated by using a semi-automatic procedure. The foldable chimney component is disposed inside a package formed by the envelope component and the tear off strip.