Although relative humidity is influenced by heating, it is a common misconception that moisture sensitive materials should be stored in a heated environment.
Even at a constant temperature the relative humidity can fluctuate wildly, the correct storage humidity seldom being achieved.In winter, heating creates an atmosphere which is very often too dry. In summer when heating systems are switched off, a decrease in night time temperature will cause a significant rise in the relative humidity, frequently to a level where the products can be damaged.
Excessive airborne moisture is one of the most destructive naturally occurring elements. Normally invisible, it affects both the quality and shelf life of food, raw materials and finished products.
Sustained exposure to high moisture levels causes corrosion of metals, solidification of powders, degradation of chemicals, disintegration of cardboard and the promotion of mould growth.