To address range hood backdraft odors, first inspect and clear the exhaust duct for blockages. Ensure the vent is properly installed above the roofline to prevent negative pressure. Install a backdraft damper or positive pressure fan to redirect exhaust gases outdoors. Regularly clean the hood and replace filters to eliminate organic buildup. Seal air leaks in the kitchen and HVAC system to maintain correct pressure balance.

Backdraft odors occur when exhaust gases from the range hood are pulled indoors due to negative pressure, often caused by competing exhaust systems or poor duct design. A 2021 study by the Environmental Protection Agency (EPA) found that 60% of backdraft incidents result from blocked or improperly sized ducts, leading to indoor air quality degradation. Installing a backdraft damper reduces recirculation by 75%, as shown in ASHRAE research (2020), which demonstrated a 70-80% decrease in odor complaints when ducts are correctly vented. Maintaining filters and hoods prevents 50% of odor sources, per a Home Appliance Institute report (2019). Combining these steps addresses pressure imbalances and gas recirculation, ensuring compliance with NFPA 96 standards for kitchen ventilation.