Smoking falls into two main categories, cold smoking (<30°C) and hot smoking (>60°C). Each category can be further broken down by smoking method: traditional wood chip smoking, smoking with fluid smoke or smoke aroma. The method can also be divided by the type of equipment used, i.e. batch smoking (smoking chambers), continuous smoking (smoke tunnel) or electrostatic smoking. Surveys carried out by Norconserv show that differences between smoking chambers from different suppliers are small. The principles are often the same. When choosing equipment the decision should be based on desired smoking method, production volume, operating costs and the properties of the product.