The main indoor environmental characteristics in the commercial field are that the overall indoor space is relatively closed. The population is relatively dense. The ventilation conditions are relatively poor; Due to the actual drawbacks such as low oxygen content and poor air quality, the central fresh air air conditioning system of the building must also be in a long-term working state.

The main indoor environmental characteristics in the commercial field are that the overall indoor space is relatively closed. The population is relatively dense. The ventilation conditions are relatively poor; Due to the actual drawbacks such as low oxygen content and poor air quality, the central fresh air air conditioning system of the building must also be in a long-term working state.

The main indoor environmental characteristics in the commercial field are that the overall indoor space is relatively closed. The population is relatively dense. The ventilation conditions are relatively poor; Due to the actual drawbacks such as low oxygen content and poor air quality, the central fresh air air conditioning system of the building must also be in a long-term working state.

The main indoor environmental characteristics in the commercial field are that the overall indoor space is relatively closed. The population is relatively dense. The ventilation conditions are relatively poor; Due to the actual drawbacks such as low oxygen content and poor air quality, the central fresh air air conditioning system of the building must also be in a long-term working state.