342.52(1)Laboratory fume hoods may be connected to a manifolded exhaust system if the following conditions are satisfied:
(a)
the requirements of section 5.3.2 of ANSI/AIHA Standard Z9.5-2003, “Laboratory Ventilation” or a standard offering equivalent or better protection are met;
(b)
when the laboratory fume hoods are installed in more than one room, hazard control measures are installed to prevent backdrafts and pressure imbalances between rooms; and
(c)
the ventilation design and installation of the manifolded exhaust system are certified by an engineer.
342.52(2)Despite subsection (1), an employer shall ensure that laboratory fume hoods that are or will be used for working with the following are not connected to a manifolded exhaust system:
(a)
radioactive materials in amounts that exceed the exemption quantity; or