Mitsubishi Electric Lossnay PZ-41SLB-E, Technical Manual, Page: 7 / 198

4
CHAPTER 1
●
Ventilation for Healthy Living
Effect of carbon dioxide (CO
2
)
Note:
According to Facility Check List published by Kagekuni-sha.
1.3 Effect of air contamination in buildings
●
Dirtiness of interior
New ceilings, walls and ornaments will turn yellow in one to two years. This is caused by dust and the tar in tobacco smoke.
2. Ventilation Standards
The legal standards for ventilation differ according to each country. Please follow the standards set by the country. In the US,
Ashrae revised their standards in 1989 becoming more strict.
In Japan, regulations are set in the The Building Standard Law of Japan Enforcement Ordinance, the so-called “Building
Management Law” for securing a sanitary environment in buildings. According to the Building Standards Law, a minimum of
20 m
3
/h per person of ventilation air is required.
Concentration (%) Effect of concentration changes
0.03 (0.04) Standard atmosphere.
0.04 - 0.06 City air.
0.07 Tolerable concentration when many people stay for long time.
0.10
General tolerable concentration.
The Building Standard Law of Japan, Law for Maintenance of Sanitation in Buildings.
0.15 Tolerable concentration used for ventilation calculations.
0.2 - 0.5 Observed as relatively poor.
0.5 or more Observed as the poorest.
0.5 Long-term safety limits (U.S. Labor Sanitation) ACGIH, regulation of laborer offices.
2 Depth of breathing and inhalation volume increases 30%.
3 Work and physical functions deteriorate, breathing doubles.
4 Normal exhalation concentration.
4 - 5
The respiratory center is stimulated; depth and times of breathing increases. Dangerous if breathed in for a
long period. If an O
2
deficiency also occurs, trouble will occur sooner and be more dangerous.
8
When breathed in for 10 minutes, breathing difficulties, redness in the face and headaches will occur.
The trouble will worsen when there is also a deficiency of O
2
.
18 or more Fatal
There is no toxic level in
CO
2
alone.
However, these tolerable
concentrations are a
guideline of the
contamination estimated
when the physical and
chemical properties of
the air deteriorate in
proportion to the increase
of CO
2
.