According to the "Hygiene Requirements for Ventilation in Primary and Secondary School Classrooms" GB ⁄ T 17226-2017, the necessary ventilation volume requirements

The proportion of fresh air required for personnel pollution in high-density buildings is higher than that required for building pollution

Design Specification for Primary and Secondary Schools GB50099-2011 Construction Quality Acceptance Specification for Fresh Air Purification System (T/CAQI 25-2017)

Methods for Testing Air Quality in Primary and Secondary School Classrooms (T/CAQI 26-2017) and Specifications for Air Quality in Primary and Secondary School Classrooms (T/CAQI 27-2017)

The three standards were officially approved and released on January 11, 2017, and officially implemented on February 1, 2017.

The standards obtained through in-depth research by the China Academy of Building Research and the China Air Purification Industry Alliance are:

intelligent control system

One or more intelligent systems control the equipment, and schools and parents can collaborate to monitor the real-time air quality in the classroom.

The Hall layering and centralized intelligent management system is an independently developed intelligent digital control system. Its purpose is to adjust the air volume of the fan based on the air quality and indoor pressure difference detected by the equipment, in order to achieve ideal indoor air quality. In order to facilitate management and meet the needs of different application scenarios, Hall has designed separate control systems and centralized management systems for each floor. This allows for separate control of different floors according to different requirements, as well as centralized control.

Hall Fresh Campus Centralized Control System

The Hall Fresh Campus Air Quality Centralized Display System is a set of systems designed to facilitate the display of indoor air quality to all school staff, teachers, and parents. It can display the air quality of each room on each floor, including temperature, humidity, AQI, PM2.5, CO2, and TVOC, on a separate TV screen in the lobby or elevator entrance and exit. Based on the air quality detected by the equipment and the indoor pressure difference, the fan airflow is adjusted to achieve the desired indoor air quality.

Option 1: Classroom installation of wall mounted machine (bidirectional flow)

2 units of H509A, 500m ³/h fresh air volume (per unit), capable of meeting the needs of 50 people (estimated at 20m ³/person)

Plan 1: Install cabinet machines in the classroom/Wall mounted machine (unidirectional flow)

2 H903300m ³/h fresh air flow units (each unit), capable of meeting the demand of 30 people (estimated at 20m ³/person)

Option 2: Install cabinet machines in the classroom (bidirectional flow)

2 units of H606800m ³/h fresh air volume (each unit), capable of meeting the demand of 53 people (estimated at 30m ³/person)

Plan 3: Install a central unit (bidirectional flow) in the classroom

2 units of D7-600600m ³/h fresh air volume (each unit), capable of meeting the demand of 40 people (estimated at 30m ³/person)