Mice in ventilation—what should you do? - briefly
Identify and seal every gap that allows rodents to enter the duct system. Deploy snap traps or bait stations within the vents, disinfect affected areas, and enlist a licensed exterminator to complete removal and implement preventive barriers.
Mice in ventilation—what should you do? - in detail
Rodent activity within air‑handling ducts poses health risks, can damage equipment, and reduces system efficiency. Immediate action should follow a systematic approach.
First, confirm the presence of mice. Look for droppings, gnaw marks, urine stains, or nesting material in accessible sections of the ventilation network. Use a flashlight and a disposable glove to avoid direct contact with contaminants.
Second, secure the area. Shut down the affected fan or unit, turn off power where practical, and seal off ventilation openings with plastic sheeting or tape to prevent further movement of the animals and limit aerosol spread of pathogens.
Third, remove the infestation. Options include:
- Live traps – place baited devices in duct access points; check frequently and release captured rodents far from the building.
- Snap traps – position in locations where mice travel; dispose of carcasses in sealed bags.
- Professional pest‑control services – engage licensed technicians for bait stations, rodenticide application, or integrated pest‑management programs, especially when infestations are extensive.
Fourth, clean and disinfect. After trapping, wear protective gloves and a mask. Remove all debris, then apply an EPA‑approved disinfectant to interior surfaces, focusing on seams, grilles, and insulation. Allow the product to remain in contact for the manufacturer’s recommended dwell time before wiping dry.
Fifth, inspect and repair the ductwork. Seal cracks, gaps, and openings with steel wool, copper mesh, or appropriate sealant. Replace damaged insulation, and ensure that all access doors have tight-fitting latches. Verify that filters are intact and replace them if they show signs of contamination.
Sixth, implement preventive measures. Install rodent‑proof screens on exterior vents, maintain a clear perimeter free of vegetation or debris that can shelter pests, and schedule regular inspections—at least quarterly—to detect early signs of activity. Keep food sources and waste securely stored to eliminate attractants.
Finally, document the entire process. Record dates of detection, actions taken, products used, and any professional services engaged. Maintaining a log supports compliance with health‑safety regulations and provides a reference for future maintenance cycles.