Where spraying is done in any room the employer concerned shall cause the ventilation system contemplated in
subregulation (3) to conform to the following requirements:
(a) If the air supply and extraction is horizontal, the average air speed measured at a level of 1,5 metres above
the floor, or at the level of the platform on which persons stand to work, shall not be less than 0,5 metres per
second;
(b) if the air supply is vertical and the extraction thereof is done through slits or a grill along the side walls at floor level, the average air speed measured at a level of 1,5 metres above the floor, or at the level of the platform on which persons stand to work, shall not be less than 0,4 metres per second; or
(c) if the air supply is vertical and the extraction thereof is done through a grill over the whole of the floor area,
the average air speed measured at a level of 1,5 metres above the floor, or at the level of the platform on
which persons stand to work, shall not be less than 0,3 metres per second.