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The quality of the gas has to meet the demand placed on it for use in a gas engine or gas turbine, as well as the demand for reduced emission to the environment. This study applies the design to the following testing of downdraft gasifier with biomass energy for municipal solid waste. The main objective of this paper is evaluating of gas purification unit performance for tar reduction in gasifier systems, integrated producer gas purification unit namely rotary separators. Experiments carried out with AFR gasification system parameters 0.48; 0.5; 0.54 and variations of the exhaust speed of the rotary separator suction fan are 0.9; 3,4; 4,4 m/s. All parameters are interpreted in order to produce producer gas that is clean from tar and impurity and has high calorific value as a substitute fuel for gasoline generators. The experimental results of the 3 variations of the test, found that gasification AFR at 0.54 is the point that produces the largest producer gas with LHV, which is 8500 kJ/Nm3, although the tar content is still relatively high at 3788.1 mg / m3. After roary separator is installed, the tar content can be reduced significantly to 210.45 mg/m3 at scrubbing water discharge 3.33 l/min and rotary separator suction speed of 4.4 m/s. In addition, the electrical power that can be generated at this time is still 60 W, so the installation and process need to be optimized again, especially for air supply to the reactor and syngas cleaning systems.