AHAM U.S. Purifier Chamber Natural Decay Test Method
Now, the purifier produced in my country will be produced according to the requirements of ANSI/AHAM AC-1-2006 in the United States. In AHAM, what kind of environmental chamber is required for the purifier to do natural decay tests? Let's take a look at the steps of the natural decay test.
Test Sample: Air Purifier
Test equipment: AHAM standard air purifier environmental chamber
Manufacturer: Huanyi Instrument
Test steps for air purifier natural decay:
1. After the ambient particulate matter concentration in the test chamber reaches the specified level, record the ambient concentration and close the test chamber environmental control device (humidifier, HEPA filter, fan, air supply valve, return air valve).
2. Immediately light a standard cigarette, put it into the cigarette smoke generator, close the generator, open the valve of the test chamber, and adjust the generator air supply to 4-6 cubic feet per minute to make the cigarette smoke meet the required initial test concentration (ie 24000 to 35000 grains/cm3).
NOTE: It takes about 45 seconds to reach the required initial test concentration
3. Close the gas source and the valve of the test chamber.
4. After the cigarette smoke reaches the initial concentration, mix for one minute before turning off the mixing ceiling fan. During the test, the recirculation fan was always on.
5. Three minutes after turning off the mixing ceiling fan, start collecting the particle concentration of cigarette smoke. The test focuses on the initial concentration of the test chamber (t=0 min). Terminate the test if the cigarette smoke concentration exceeds the initial range.
6. Collect particle concentration data every one minute for a total of 20 minutes. A minimum of nine particle concentration data points above the lower limit of the instrument's measurable limit are required.
7. Record the average relative humidity and temperature of the test chamber during the test. The test is invalid if the relative humidity and temperature exceed 40±5%, 21±3°C and the air exchange rate exceeds 0.03 times/hour.
8. Calculate the cigarette smoke decay constant.
Calculate the standard deviation of natural decay to determine the acceptability of the test. Relative to the 95% confidence limit, the standard deviation should be less than 0.002 grains per minute or 10% (whichever is greater), otherwise the test is not acceptable.
