Provided are methods for ventilating a surgical theater using temperature-regulated laminar air flow. Velocity of a downward directed laminar clean air flow is determined by an air-temperature difference between the supply air and room air temperature at the level of the operating table. Room air temperature at the level of the operating table is measured and clean supply air temperature controlled in relation to this measurement. In order to maintain a constant downward directed laminar clean air flow velocity, a constant difference in temperature is maintained between room air temperature at the level of the operating table and the lower temperature of the supply air. In preferred embodiments, this constant temperature difference provides a downward directed air flow velocity of at least 0.25 m/s and is maintained in part by minimizing fluctuations in ambient air-temperature through use of air supply units supplying heated or cooled air outside the clean air zone. Also provided are ventilating devices which create a uniform and stable downward laminar air flow that forms a clean air zone surrounding the operating table workplace region. Preferred embodiments comprise a number of air supply units arranged in a closed pattern, e.g, in a circle, with air stop and guide units situated between air supply units such that a widely spread uniform and stable, downward, combined, laminar air flow is created.温度制御空気層流を用いた手術室の換気方法が提供される。下向き層流の速度は、供給空気と手術台のレベルでの室内空気の間の空気温度差によって決定される。手術台のレベルの室内空気温度が測定され、この測定に関連して清浄供給空気温度が制御される。一定の下向き清浄空気層流速度を維持するため、手術台のレベルでの室内空気温度と供給空気のより低い温度との間で温度差を一定に維持する。手術台作業場領域を取り巻く清浄空気ゾーンを形成する均一かつ安定な下向き空気層流を作り出す換気装置も提供される。
