Regularly scheduled maintenance of your furnace, HVAC or heat recovery ventilation unit should include furnace duct cleaning to ensure that the air delivered within your home is not recirculating airborne debris which can include things like pet dander, dust mites, and rodent debris. Call Oliver’s Power Vac & Chimney Sweep to schedule your furnace duct cleaning, especially if you are noticing: Dust accumulating on your furniture even shortly after cleaning. Persistent musty odours. Air flow through your furnace ducts is not as powerful as it could be. A worsening of respiratory allergy symptoms.