The required minimum

The required minimum cross-sections of ventilation ducts are shown in Table 1.3.
Small air ducts and dimensions of air inlet and outlet openings shall be calculated based on an air speed
lower than 0.5 m/s.
E.9.4 Ventilated rooms with battery charging power more than 2 kW
Batteries exceeding charging power of 2 kW shall be installed in closed cabinets, containers or battery
rooms forced ventilated to open deck area. Lead batteries up to 3 kW may be ventilated by natural
means.
Battery Rooms shall be arranged according to GL Rules for Electrical Installations (I-1-3), Section 2, C.3.
E.9.5 Ventilation requirements
Ventilation inlet and outlet openings shall be so arranged to ensure that fresh air flows over the surface of
the storage battery.
The air inlet openings shall be arranged below and air outlet openings shall be arranged above.
If batteries are installed in several floors, the free distance between them shall be at least 50 mm.
Devices which obstruct the free passage of air, e.g. fire dampers and safety screens, shall not be mounted
in the ventilation inlet and outlet ducts of battery-rooms.
Air ducts for natural ventilation shall lead to the open deck directly. Openings shall be at least 0.9 m above
the cupboard/ boxes. The inclination of air ducts shall not exceed 45° from vertical.
Battery room ventilators are to be fitted with a means of closing whenever:
 The battery room does not open directly onto an exposed deck, or