Used when the pest is inside the object: termites or wood borers in furniture, sofas, beds, doors, frames or closets. The item is covered and sealed to create an airtight chamber, and a fumigant gas is released inside that penetrates every gallery and cavity.
It is highly effective because it reaches where a liquid can't. Only certified staff perform it, with the area isolated and signposted, and the item isn't used until the technician clears it.