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"A telltale sign your ducts need to be cleaned is a constant layer of dust settling around your home. You can also lift up one or two of your vent covers and see if they are filled with dust or debris, which will give you an idea of how the rest of your ducts look. If you have recently renovated a room in your home, you should consider scheduling a cleaning to remove any particles that may have travelled into your HVAC system."
<https://www.powervacofottawa.ca/duct-cleaning/>