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Drying Systems The above mentioned drying methods are then combined into several different drying systems. An assessment of these systems is provided in Table 2. Table II Drying Systems and Quality for 4/4 Lumber Drying Oak, Beech System AD-NT F-P AD(Shed)-NT VG FAAD-NT NS LT VG LT-NT VG NT OK Hickory, Pecan, Hard Maple OK VG F-P VG VG VG Ash, Basswood, Yellow-Poplar, Gum, Soft Maple, Pine, Aspen OK VG VG VG VG VG VG = very good; OK = okay; F-P = fair to poor; NS = not suggested Degrade One of the key points in evaluating a drying system is the degrade level. Further, where two drying methods are combined into a drying system, such as air drying followed by kiln drying, any damage done in the first method cannot be repaired or mitigated in the second method. Specifically, lumber damaged in air drying or predrying will not improve during kiln drying, even when kiln drying is done perfectly. The following comments on degrade in the various drying methods are intended as an outline. Further information is provided in the publications mentioned previously. Air Drying Degrade Degrade or loss in value in an air drying operation can exceed 10 percent of the lumber value. 10PDF Image | Principles and Practices of Drying Lumber
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