Construction requirements:

1. For the particle test, the concentration of particles above 0.3 um should be less than or equal to 1 000/L;

2. For the gaseous pollutant test, the concentration of formaldehyde, toluene and TVOC should be less than 

50% of the corresponding limit value of GB/T 18883, and it should also meet the requirements of particulate 

matter test;

3. For the test of gaseous pollutants other than formaldehyde, toluene and TVOC, in addition to meeting the 

above two requirements, the background concentration of the corresponding target pollutants should not be

higher than 50% of the GB/T 18883 limit.

Test steps:

1. Before the first test of the prototype, it should be run at the maximum gear for at least 1h under the 

specified test conditions. After the trial operation is over, install the prototype into the test chamber and keep 

the prototype closed;

2. Remove all other items in the test chamber that are not related to the experiment, and open the purification 

module to purify the background of the test chamber. If the background concentration of the gaseous target 

pollutant to be measured is lower than the relevant requirements of GB/T 18883-2002, start the temperature 

and humidity control device to ensure that the test chamber meets the specified test conditions at the 

beginning of the test;

3. Turn on the power monitoring and data acquisition system of the purifier performance test chamber;

4. Start the purification system of the test chamber, and close the purification system when the PM2.5 

concentration in the test chamber is not higher than 1 μg/m³. After closing the purification system, test the 

background concentration of carbon dioxide in the 81m³ purifier performance test chamber, expressed in %;

5. Feed carbon dioxide into the test chamber, turn on the stirring fan, after reaching a certain amount, stir the 

stirring fan for another 10 minutes;

6. After stirring for 10min, use three carbon dioxide analyzers to measure the initial concentration of carbon 

dioxide respectively, and take the average value to calculate as the initial concentration of carbon dioxide 

C0. The initial concentration of carbon dioxide at the beginning of the test should be (0.5% + background 

concentration ± 0.01%); during the test, the stirring fan has been kept on;

7. After the initial concentration in the purifier performance test chamber is measured, turn on the new 

fan to be tested, start the maximum gear, and the time of opening is T=0 min. At the same time, carbon 

dioxide concentration collection starts. Collect and record once every 1 min, the continuous measurement 

time is the theoretical test time T, and T is calculated according to the formula;

8. Turn off the new fan, start the exhaust system of the test chamber, the carbon dioxide concentration in the 

test chamber is not higher than the background concentration, close the exhaust system of the test chamber,

and open the test chamber.