Air Refreshment / Air Quality Change Test
 
Materials
• Window screen Ultra Antibacterial (x3)
• CO2 sensors for inner (2x) and outer conditions (1x).
• Temperature and humidity sensor for inner (2x) and outer conditions (meteostation).
• Wind velocity and direction (meteostation).
• Auxiliary fans for uniform CO2 distribution in room.

Methodology
1. Testing Reference Numbers; 
a. A meeting ambience created by 2-3 person or by steady CO2 production from a gas tank. Gas tank has advantage of constant CO2 feeding into the room.
b. Window closed until concentration of CO2 reaches 1500 ppm. Then CO2 stops and window opens. Concentration decrease in time is measured.
c. The case repeats 3 times to receive an appropriate dataset.
d. All other ventilation systems were closed or off.
2. Testing Window Screen
a.	The same indoor setup and procedure
b.	Installation of windows with screen and repeat same meeting conditions. All ventilation systems are off.

Options;
1. After each meeting only 1 window opens. (2 pairs of tests = with screen and without screen)
2. After each meting all windows and doors open. (2 pairs of tests = with screen and without screen)
3. During the meeting only 1 window keeps open (2 pairs of tests = with screen and without screen)
a. Equal CO2 production as in other tests, start at 1500 ppm BUT CO2 production continues with open windows.
b. Results will show some concentration decrease and may be constant value after, this should differ between test with and without screens.

Six different conditions and total 6 times of testing are stated as an initial test.
1 test stands for 3 repeated cases.
It is important to observe carefully outer conditions. Outside temperature, wind velocity and direction supposed to be (almost) equal for particulate pairs of tests (which tests the same option).
