Mitsubishi Electric Lossnay LGH-15RX3 Technical Manual page 126

1.4 Industrial Safety and Health Act
These laws include many categories that in the past were covered independently in relation to labor safety and sanitation. The
included items that should be complied with, in addition to those related to air adjustment such as waste air figured per one
laborer, ventilation, dust removal, air flow, and heat and humidity control, are boiler construction, manufacture, use, operator
certification, certification of workers carrying out the construction of the air adjustment device, or the safety of working on
scaffolding or other high places. However, because here we are dealing only with those items with a deep relation to air
adjustment planning, there is a demand for another chance for research.
1.4.1 Office Sanitation Standard Regulations
The following points about ventilation, etc., of the office (see Caution 2) where workers (see Caution 1) work are established.
(Indoor work other than in offices is according to the Labor Safety and Sanitation Regulations).
Caution
Caution 1. Workers as defined by the labor laws does not refer to types of occupations, but people who work in offices or
indoor workplaces, (including public officials), and are paid wages. However, this does not apply in cases
where only relatives are using the office or working out of the home.
Caution 2. In this office, other than general office work (including related writing or filing), working in a room for a card line
hand held typewriter or other mechanical work equipment is included. However, factories, or work places with
one area free-standing or separated work area are not classified as offices or work places under this
regulation. (Places where people work that are not covered by this law are subject to the Labor Safety and
Sanitation Law).
Regular ventilation
There must be an opening directly to the outside air (See Caution 1), and it must have an opening section of at least 1/20 of
the total floor space, otherwise a ventilation device is required (See Caution 2). Furthermore, the density of carbon monoxide
(CO) in the room must be under 50 ppm, and the density of carbon dioxide (CO
Caution
Caution 1. Openings facing corridors, lobbies, etc., are not included.
Caution 2. Natural ventilation devices, as stated in "Ventilation," Item 9, section 2-1 of the Buildings Standards Law,
includes air quality adjustment devices (as long as they are capable of drawing in fresh air) as well as
mechanical ventilation devices.
The formula generally used to calculate the necessary ventilation capacity to keep CO
accepted limits is given below.
k
y =
p-q
y : required ventilation (m
k : CO given off by one person each hour (usually 0.02 m
2
p : acceptable level of CO
q : density of CO
This formula only deals with carbon dioxide exhaled by people. When gas using devices or other combustion devices are being
used in the room, it is necessary to check the amount of carbon dioxide given off by the device and add, and check the amount
of air needed by the device and add.
CHAPTER 10 G Ventilation Standards in Each Country
× 100
3
/h) per 1 person
in the room (%)
2
in fresh air (%) (usually about 0.03% to 0.04%)
2
) must be under 5,000 ppm.
2
3 3
to 0.05 m )
density levels under
2
123