This research aims to study the effects of frequency and lifting effect of reducing the moisture in the grain dryers Dumas House float. By tests in rooms that are spacious 20 cm x length 95 cm x height 30 cm frequency of lifting the drying room 140 rpm, 1 50 rpm and 160 rpm lift drying room in the 4 cm, 4.6 cm, and 5.2. cm thickness of the grain used in the experiment are five levels: 1 2 3 4 and 5 cm using a flow rate of air from 0 - 0.3 m3 / s found that the porosity of paddy drying room to add. Based on the flow rate of the air increases. It also found that the lift 4 cm speed of lift 140 rpm rate of air flow 0.3 m3 / s and depth of paddy 3 cm porosity of paddy drying room is worth more than the other conditions. When comparing the moisture content of the air flow and the porosity of lift 4 cm speed of lift 140 rpm and the depth of paddy 3 cm showed that the rate of air flow 0.2 m3 / s and the range. 0:45 to 0:50 porous paddy drying room can exude moisture than the other conditions, therefore suitable for drying most of the conditions that cause porosity appropriate. Air can be distributed throughout the drying room
Keywords: lift, lift frequency drying, air drying, the Flo Thomas, porosity.
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