Steel Roof drains of VILPE Oy are manufactured at the Vantaa site in Finland. Plastic gratings are manufactured at the Mustasaari site. The production process of grating consists of raw material delivery, injection molding, quality inspection, and packaging. During injection molding, the raw material is plasticized, injected into the mold, cooled, and removed from the mold. The HST bodies of steel roof drains are manufactured by a subcontractor in Finland using deep drawing and laser cutting. In Vantaa, thebody of roof drain is assembled and packaged. According to customer preferences and case-by-case requirements, some of them are fitted with a bitumen flange by flaming, and some are cut to specified lengths. Production requires electricity and heat.About 50% of the electricity comes from the production facility's own solar power plant, and the rest is from nuclear electricity.