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Nyle started with Dr. Wengert’s list and expanded it for a number of northeastern species (see the far right column in Table 10)22. A good starting point might be to try to get about 75% of the listed maximum moisture losses per day. Aim for a slightly lower maximum loss rate for lower quality or more variable wood. This table is for 4/4 lumber; to estimate the maximum moisture content loss per day for other thicknesses, Nyle suggests multiplying the maximum MC loss per day from this table by 0.6 for 6/4 lumber and by 0.4 for 8/4 lumber. Use your fastest-drying samples to compare your drying rate to the table above. Most kiln operators running DH kilns never attempt to dry at the maximum rates listed in this table. Trying to dry lumber too quickly only increases the chances for drying problems. Table 10. Useful species information, with acceptable maximum moisture content (%) loss per day for northeastern 4/4 lumber SPECIES OVENDRY WEIGHT #/MBF AVE. GREEN MC% GREEN WEIGHT #/MBF # WATER LOST PER 1% MC MAX. MC% LOSS PER DAY Cedar, eastern white Fir, balsam Hemlock, eastern Larch, eastern Pine, red (Norway) Pine, eastern white Spruce, black Spruce, red Spruce, white Softwoods 1578 93 3046 16 11 1739 118 3790 17 20 2161 111 4558 22 20 2532 52 3849 25 20 2051 83 3747 21 15 1950 90 3705 20 12 2110 80 3798 21 20 2000 89 3781 20 20 1840 115 3967 18 20 22 http://www.nyle.com/downloads/L200Manual_Web.pdf, pages 2-5 and 2-6 92PDF Image | HARDWOOD DRY KILN OPERATION A MANUAL FOR OPERATORS OF SMALL DRY KILNS
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