What should you do if a rat is in ventilation? - briefly
Close and block the vent to prevent further entry. Then call a licensed pest‑control service to trap and remove the rat safely.
What should you do if a rat is in ventilation? - in detail
If a rodent is found inside a ventilation system, act quickly to protect health, prevent damage, and eliminate the infestation.
First, secure the area. Shut down the affected fan or blower to stop airflow that could spread droppings, urine, or allergens throughout the building. Turn off electricity to the unit if safe to do so, and place a warning sign to keep occupants away.
Next, assess the extent of the problem. Inspect visible sections of ductwork for gnaw marks, nests, and waste. Use a flashlight and, if possible, a borescope to view hidden sections. Document locations of entry points, damage, and contamination.
Then, engage a licensed pest‑control professional. Provide them with the inspection findings and request a thorough removal plan that includes:
- Trapping or humane capture of the animal inside the ducts.
- Disinfection of contaminated surfaces with EPA‑approved rodent‑specific cleaners.
- Repair or sealing of any gaps, holes, or vent covers that allowed entry.
- Replacement of insulation or filters that have been compromised.
While waiting for the specialist, limit ventilation to unaffected zones to reduce the spread of allergens. If the building is occupied, advise occupants to keep windows closed and use portable air cleaners with HEPA filters in nearby areas.
After removal, conduct a comprehensive cleaning. Remove all debris, wash interior surfaces with a detergent solution, then apply a disinfectant. Replace filters that have been exposed to rodent waste, and inspect the entire system for residual contamination.
Finally, implement preventive measures:
- Seal all exterior openings larger than ¼ inch with steel wool, mesh, or expanding foam.
- Install vent covers with tight-fitting screens.
- Maintain a regular inspection schedule, checking for signs of gnawing, droppings, or new entry points every six months.
- Keep surrounding areas free of food sources, garbage, and clutter that attract rodents.
By following these steps, the ventilation system can be restored to safe operation, and the risk of future incursions will be minimized.