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Dealing with situations where the result exceeds the dangerous concentration level.
Where the installation of a facility results in a concentration in excess of the dangerous concentration
level then it may be necessary to revise the system design to some extent or else take one of the fol-
lowing courses of action:
<Action 1> Making openings which will allow the air to flow freely into the room.
Make openings above and below the door which are each equivalent in size to 0.15% or more
of the floor area or make a doorless opening.
<Action 2> Fit a mechanical ventilator linked to a gas leak detection alarm device.
Indoor unit
Action 2
Gas leak detection alarm device
Mechanical ventilator
Action 1
Make openings sufficiently large
to permit a free flow of air
DVM E-D/B(chapter5)-E<03759 3/21/02 7:40 PM Page 43