342.2An employer shall ensure that a laboratory fume hood meets the following requirements:
(a)
the laboratory fume hood is connected to a local exhaust ventilation system;
(b)
the average face velocity across the operational face opening of the laboratory fume hood is 0.4 m/s to 0.6 m/s;
(c)
the face velocity is not less than 80% of the average face velocity required under paragraph (b) at any point across the operational face opening of the laboratory fume hood; and
(d)
the face velocity is not more than 120% of the average face velocity required under paragraph (b) at any point across the operational face opening of the laboratory fume hood.