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Table 307 (Kn-21) Temperature Equilibrium Dry- Wet- moisture Relative Dry- Wet- Step Time bulb bulb content humidity bulb bulb h 1 0to168 2 168to336 3 336to504 4 504to672 - - - - - - °F - - - - - - - - - - - - pct - - - - - - - - - - - - °C - - - - - - 105 Ventsopen – – 46.5 – 130 105 6.7 43 54.5 40.5 145 105 4.2 26 62.5 40.5 150 105 3.8 23 65.5 40.5 5 672to840 160 110 3.4 21 71.0 43.5 No conditioning. Table 308 R-5 Temperature Equillbrium Temperature Dry- Wet- moisture Relative Dry- Wet- Step Time bulb bulb content humidity bulb bulb Temperature h - - - - - - °F - - - - - - 1 0to24 115 1100 - - - - - - pct - - - - - - - - - - - - °C - - - - - - 9.6 58 46.0 137.5 7.9 49 49.0 137.5 8.0 51 51.5 140.5 8.0 52 54.5 143.5 8.0 54 60.0 149.0 10.4 68 60.0 352.5 2 24to72 3 272 to 96 4 96to120 5 120to144 6 144to156 or until dry 1 Spray off; vents working. 120 1100 125 1105 130 1110 140 1120 140 3127 2 If drying partly air-dried stock, you may not want to go higher than settings in step 3 so as not to aggravate stain that may have occurred in the yard. 3 Spray on; vents working. Table 309 (Ca-1) Temperature Equilibrium Temperature Dry- Wet- moisture Relative Dry- Wet- Step Time bulb bulb content humidity bulb bulb - - - - - - °F - - - - - - 1 0to12 2 12to36 3 36to60 4 60to84 5 84to108 130 1105 6 Equalize 140 2130 1 Spray off; vents working. - - - - - - pct - - - - - - - - - - - - °C - - - - - - 12.0 70 43.5 37.5 12.1 72 49.0 143.5 9.6 60 49.0 140.5 7.8 49 49.0 137.5 6.7 43 54.5 140.5 12.0 75 60.0 254.5 h 110 1100 120 1110 120 1105 120 1100 2 If wet bulb will not reach 130, turn on spray. Check moisture content of lumber after 36 h. Hold until wettest samples are down to desired target moisture content. 116PDF Image | Dry Kiln Schedules for Commercial Woods Temperate and Tropical
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