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A termite insecticide (fipronil) is not to be used indoors, except in wall voids. If a hole was drilled in a baseboard or wall and the the foam was delivered through the wall, is this considered delivery to a wall void?

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Yes, the void is the space inside the wall. It could be between joists in a wood wall or in the channels inside concrete blocks. It basically just means empty spaces in a wall.

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