Daikin VAM-FA8VE Technical Data Manual page 255

• HRV • VKM-GA(M)V1
Table 6 Effect of Carbon Monoxide (CO)
Concentration (ppm)
0.01~0.2 Standard atmosphere
5 Long-term based allowable value
Building Standard Act and Building Control Act
10 use this value as the 24-hour average
environmental standard.
Short-term based allowable value: 8-hour
20
average environmental standard
Vocational environment allowable concentration
50
(Japan Industrial Safety and Health Association)
No effect up to 3 hours, effect after 5 hours,
100 headache after 8 hours, malignant disease, long-
term harmful, non-lethal
200 Slight pain in the forehead within 2~3 hours
400 Pain in the forehead within 1~2 hours, and occipital part within 2~3 hours
800 Headache, giddiness, nausea and convulsion in 45 minutes, and swoon in 2 hours
1,600 Headache and giddiness in 20 minutes, and death in 2 hours
3,200 Headache and giddiness in 5~10 minutes, and death in 30 minutes
6,400 Death in 10~15 minutes
11,800 Death in 1~3 minutes
Scores of thousands ppm
Possible for automobile exhaust emissions
(several %)
Fig 2 Relationship in Concentration between Oxygen and CO
CO production rate
<CO safety limit is 10 ppm with max. 5 ppm recommended>
Carbon Dioxide (CO )
2
Carbon dioxide gas is a normal component of the air, normal concentration of about 0.04%.
Physiologically, CO gas is requisite for human life: the gas stimulates the respiratory center for
2
unconscious, automatic breathing. CO
the proper level for the purpose of sustaining normal functions of human body. Hygienically, CO
used as an indicator of the atmospheric condition in the room, not treated as a toxic gas.
Higher concentration of CO gas will adversely affect the human body, though the effect closely depends
2
on the oxygen concentration.
• HRV • Heat Reclaim Ventilation
Effect of change in concentration
Source: Facility Check List published by Eikoku-Sha
3
(m /kg)
0.020
0.015
0.010
combustion rate
0.005
Larger
combustion rate
18 19 20
Oxygen concentration (%)
gases dissolve into blood to maintain the oxygen concentration at
2
About 5 ppm in annual average
for urban roads; over 100 ppm
possible for motor highways,
tunnels and parking areas
Smaller
21
2
2
11
gases are
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