A method and apparatus for pest control in which chambers are permanently placed at various positions in the walls of a building. Each chamber comprises a duct having an open proximal end and holes in its sides. The chambers may be placed in the walls either during building construction or in retrofit applications. Insecticide or rodenticide is sprayed or placed in the chamber using extermination methods known in the art. A cover plate prevents children and pests from accessing a chamber and any pest control substance within it. In a further embodiment, an adaptor nozzle is placed on a sprayer of fogger nozzle before insertion into the chamber. When rodenticide or insecticide is sprayed through the nozzle, the nozzle evenly disperses the rodenticide through the holes in the chamber to ensure the entire cavity of the interior wall is reached.
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