| 摘要 |
A method of exterminating harmful insects under the floor of a house or building comprises spraying insecticide into the enclosed area under the floor of the house or building. For the purposes of this patent application the meaning of the word insecticide encompasses substances which deter insect presence as well as substances which kill insects. The insecticide used, is in the form of a fine adhesive powder which is loaded into an airtight dispenser. The dispenser has an opening for the insecticide to pass through. The opening is initially blocked by insecticide while pressure inside the dispenser is increased. Subsequently, insecticide is forced out the dispenser opening and delivered to a nozzle which sprays the insecticide under the building floor at a high exit velocity. The air in the enclosed area under the floor of the building is stirred up by the fluid energy delivered by the jet of fine powser insecticide. The insecticide mixes with the disturbed air to be distributed to, and to coat exposed surfaces and adhere in crevices in the area under the building floor.
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