PROBLEM TO BE SOLVED: To put a vegetable/flowering plant-raising facility with no need of using any insecticide to practical use by making a greenhouse with a structure of enabling even fine insects to be prevented from intrusion thereinto. SOLUTION: By forcing the outside air into a greenhouse by a ventilator, air pressure in the greenhouse is kept at a level higher than the atmospheric pressure to prevent the greenhouse from pest intrusion and pollution, and by spraying the outside air taken into the greenhouse with well water, effects including pest washing off and temperature and humidity conditioning can be afforded. Thus, by eliminating skylights and sidewall ventilative windows seen at conventional greenhouses and adopting a forced ventilation means to keep the inside of the greenhouse at air pressure higher than the atmospheric pressure, and also by sufficiently washing the air inside the greenhouse with much well water, such a greenhouse structure as to enable even fine insects to be washed off and excluded is adopted. COPYRIGHT: (C)2008,JPO&INPIT
