1. Check whether the flue is unobstructed: you can ask a professional flue cleaning company to clean the flue to ensure that the flue is unobstructed and the indoor air quality will not be affected when the flue gas and harmful gases are discharged.
2. Installation of flue exhaust equipment: If the flue cannot be opened or needs to be modified, consider installing flue exhaust equipment, such as chimneys and exhaust fans, to discharge flue gas and harmful gases.