The Ontario Building Code | General Ventilation
220.127.116.11. General ventilation
(a) do not accumulate in the laboratory,
(c) do not accumulate in the ventilation system,
(d) are exhausted to the outdoorref ="http://thehandyforce.com/doors/" title ="Toronto Door installer">doors, and
(e) are not returned to the building.
(2) A ventilation system required in this Subsection shall be provided with monitoring devices that,
(a) indicate that the ventilation system is in operation, and
(b) sound an alarm if the ventilation system is malfunctioning.