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• It is a permanent opening.
• It extends to the floor.
• It is intended for people to walk through.
For fixed appliances, the area of the adjacent rooms, on the same floor, connected by
permanent opening in the walls and/or doors between occupied spaces, including gaps
between the wall and the floor, can be considered a single room when determining
compliance to Amin, provided all of the following are met.
• The space shall have appropriate openings according to Sec.2.
• The minimum opening area for natural ventilation Anvmin shall not be less than the
following:
Height of outlet/m
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
Note: Take the Mc =5.0kg as an example. For appliances serving one or more rooms
with an air duct system, the room area calculation shall be determined based on the
total area of the conditioned space (TA) connected by ducts taking into consideration
that the circulating airflow distributed to all the rooms by the appliance integral indoor
fan will mix and dilute the leaking refrigerant before entering any room.
Opening conditions for connected rooms
When the openings for connected rooms are required, the following conditions shall be
applied.
• The area of any openings above 300mm from the floor shall not be considered in
determining compliance with Anvmin.
• At least 50% of the required opening area Anvmin shall be below 200mm from the floor.
• The bottom of the lowest openings shall not be higher than the point of release when the
unit is installed and not more than 100mm from the floor.
• Openings are permanent openings which cannot be closed.
– For openings extending to the floor the height shall not be less than 20mm above the
surface of the floor covering
• A second higher opening shall be provided. The total size of the second opening shall not
be less than 50% of minimum opening area for Anvmin and shall be at least 1.5 m above the
floor.
NOTE: The requirement for the second opening can be met by drop ceilings, ventilation
ducts, or similar arrangements that provide an airflow path between the connected rooms.
A/m²
Mc/Kg
5
5.0
6
5.0
7
5.0
8
5.0
9
5.0
10
5.0
11
5.0
12
5.0
13
5.0
14
5.0
15
5.0
16
5.0
17
5.0
Mmax/kg
2.685
2.941
3.177
3.396
3.602
3.797
3.983
4.160
4.330
4.493
4.651
4.803
4.951
05
Anvmin/m²
0.045
0.042
0.038
0.035
0.031
0.028
0.024
0.020
0.016
0.013
0.009
0.005
0.001
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