1. Equipment: Pest control professionals use specialized equipment, such as carbon monoxide generators or machines, to produce controlled amounts of carbon monoxide gas.

2. Gas Delivery: The carbon monoxide gas is delivered directly into the burrows or tunnels of the rodents. It's important to seal off all the entrances and exits to the burrow system to ensure the gas remains concentrated within the tunnels.

3. Asphyxiation: Carbon monoxide is a colorless, odorless, and tasteless gas that, when inhaled by rodents, interferes with their ability to transport oxygen in their blood. Essentially, it suffocates them, causing them to lose consciousness and eventually die.

4. Monitoring: Pest control professionals typically monitor the fumigation process to ensure that all burrows are adequately treated and that the rodents are effectively eliminated.

5. Safety Precautions: Safety precautions are crucial when using carbon monoxide for pest control. Professionals wear appropriate protective gear and ensure that no humans, pets, or non-target wildlife are in the vicinity during the fumigation process.

6. Ventilation: After the treatment is complete, the burrows are often ventilated to allow the carbon monoxide to dissipate and make the area safe for humans and other animals.

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Carbon monoxide fumigation is preferred for several reasons. It is considered environmentally friendly because it doesn't leave behind toxic residues or chemicals in the soil. Additionally, it is humane because it causes minimal suffering to the rodents compared to some other pest control methods.

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However, it's essential that this method is performed by trained professionals who can safely and effectively administer the treatment, as carbon monoxide is a dangerous gas when mishandled and can pose serious health risks to humans and animals.