WOOD PRODUCTS MANUFACTURE is a vital segment of the economy of Shasta County; however, as with most industry, it is not an unmixed blessing. Wood products manufacture is essentially a reduction process and residues generated at each stage have become increasingly acute in recent years. Operators are faced with the necessity of increasing the percentage of raw material converted to marketable products in order to maintain a competitive position. On the other hand, they are faced with increasing pressure from the community to reduce or eliminate the smoke and ash problems caused by common residue disposal methods.