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Conventional and Elevated Temperature Schedules: Softwoods (Tables 200-31 6) This group of tables contains schedules suggested for use with softwood (conifer) lumber and are typically used with steam-heated kilns. However, a few tropical hardwoods are dried under these schedules. Both moisture content (MC)-controlled schedules for products requiring very close control of final MC, such as furniture, millwork, and cabinet stock, and time-controlled schedules more generally used for drying products used in construction are listed. Table 200 In a few of the schedule headings, the word "modified" appears in parentheses after the coded designation, e.g., Table 1, T3-F4S (Modified). This means we have modified the suggested schedule(s) from Agriculture Handbook 188, Dry Kiln Operator's Manual, so that the wet-bulb temperature (WBT) is never less than 90 °F. During periods of hot humid weather, it may not be possible to achieve WBT's below 90 °F even with continuous venting. When energy conservation is a prime consideration, continuous venting may not be the best overall alternative as heat is lost in this process of controlling the WBT or relative humidity in the kiln. As a practical approach, we have suggested limiting the minimum WBT to 90 °F. Most schedules have dry-bulb temperatures between 110 and 200 °F. T3-F4S (Modified) Temperature Equilibrium Temperature Moisture Dry- Wet- moisture Relative Dry- Wet- Step content bulb bulb content humidity bulb bulb pct - - - - - - °F - - - - - - 110 103 - - - - - - pct - - - - - - 14.2 78 12.0 70 9.5 58 7.6 46 7.6 46 5.5 32 4.8 28 4.9 31 3.4 21 - - - - - - °C - - - - - - 43.5 39.5 43.5 37.5 43.5 35.0 43.5 32.0 43.5 32.0 49.0 32.0 54.5 35.0 60.0 40.5 71.0 43.5 T3-F5S(Modified) 1 Above 70 2 70 to 60 3 60 to 50 4 50 to 40 5 40 to 30 6 30 to 25 7 25 to 20 8 20 to 15 9 15 to Final Equalize and condition as necessary (see appendix 110 100 110 95 110 90 110 90 120 90 130 95 140 105 160 110 A). Table 201 Temperature Equilibrium Moisture Dry- Wet- moisture Relative Dry- Wet- Temperature Step content bulb bulb content humidity bulb bulb - - - - - - °F - - - - - - 1 Above70 110 100 2 70to60 110 96 3 60to50 110 90 4 50to40 110 90 5 40to30 110 90 6 30to25 120 90 7 25to20 130 95 8 20to15 140 105 9 15toFinal 160 110 Equalize and condition as necessary (see appendix A). - - - - - - pct - - - - - - 12.0 70 9.9 60 7.6 46 7.6 46 7.6 46 5.5 32 4.8 28 4.9 31 3.4 21 - - - - - - °C - - - - - - 43.5 37.5 43.5 35.5 43.5 32.0 43.5 32.0 43.5 32.0 49.0 32.0 54.5 35.0 60.0 40.5 71.0 43.5 pct 80PDF Image | Dry Kiln Schedules for Commercial Woods Temperate and Tropical
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