<；P>；PROBLEM TO BE SOLVED: To provide a blast system intended for solving such problems that a blast system remains devising air flow in a greenhouse and/or setting a plant raising environment, and is not sufficient to secure air flow of an almost horizonal direction to the longitudinal direction of the greenhouse and wide-area air flow and is not perfect to increase crop yields by expansion of a sowing area in the greenhouse and to improve workability for crops. <；P>；SOLUTION: This blast system of a greenhouse is formed by hanging one or a plurality of insect-proof nets from a ceiling plane of both gable surface insides of the greenhouse, forming an opening part stretched with no insect-proof net on the lower end of the greenhouse by folding in an orthogonal direction to the outside so as to surround a fan and/or a ventilating fan with the insect-proof net, and stretching the insect-proof net. As a result of this, air flow of an almost horizonal direction to the longitudinal direction of the greenhouse and wide-area air flow are secured, and expansion of a sowing area in the greenhouse and improvement of workability efficiency are secured by forming the opening part. <；P>；COPYRIGHT: (C)2008,JPO&INPIT
