E.9.6 Forced ventilation

E.9.6 Forced ventilation
If natural ventilation is not sufficient or required cross- sections of ducts according to Table 1.3 are to big,
forced ventilation shall be provided.
The air quantity Q shall be calculated according to E.9.3.
The air speed shall not exceed 4 m/s.
Where storage batteries are charged automatically, with automatic start of the fan at the beginning of the
charging, arrangements must be made for the ventilation to continue for at least 1 h after completion of
charging.
Wherever possible, forced ventilation exhaust fans shall be used. The fan motors must be either certified
safe type with a degree of protection IIC T1 and resistant to electrolyte or, preferably, located outside of
the endangered area.
Fans are to be of non-sparking construction according to D.6
The ventilation systems shall be independent of the ventilation systems serving other rooms.
Air ducts for forced ventilation shall be resistant to electrolyte and shall lead to the open deck.