[Code of Federal Regulations]
[Title 46, Volume 7]
[Revised as of October 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 46CFR194.15-5]

[Page 388-389]
 
                           TITLE 46--SHIPPING
 
   CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED)
 
PART 194_HANDLING, USE, AND CONTROL OF EXPLOSIVES AND OTHER HAZARDOUS 
MATERIALS--Table of Contents
 
      Subpart 194.15_Chemistry Laboratory and Scientific Laboratory
 
Sec. 194.15-5  Ventilation.

    (a) Operations, reactions or experiments which produce toxic, 
noxious or corrosive vapors shall be conducted under a suitably 
installed fume hood. The fume hood shall be equipped with an independent 
power exhaust ventilation system which terminates so as to prevent fumes 
from entering other portions of the vessel. The exhaust system of the 
fume hood shall be compatible with the ventilation system of the 
laboratory to prevent fumes from backing-up within the fume hood system. 
The terminals shall be equipped with acceptable flame screens.
    (b) Chemical laboratories shall be equipped with power ventilation 
system of the exhaust type serving the entire laboratory for use in the 
event of spills or other emergencies. The system shall have a capacity 
sufficient to effect a complete change of air in not more than 4 minutes 
based upon the volume of the compartment.
    (1) Power ventilation units shall have nonsparking impellers and 
shall not produce a source of vapor ignition in either the compartment 
or the ventilation system associated with the compartment.
    (2) The power ventilation system shall be interlocked with any other 
ventilation or air-conditioning system serving the laboratory in a 
manner to prevent the circulation of vapors to other spaces.
    (3) This ventilation system shall be independent of any other 
ventilation system in the vessel. It shall serve no other space. It 
shall be of watertight construction.
    (4) Ventilation exhaust outlets shall terminate more than 6 feet 
from any

[[Page 389]]

opening to the interior part of the vessel and from any possible source 
of vapor ignition.
    (5) The control for the power ventilation system shall be 
conveniently located and marked in a manner to clearly identify the 
purpose of the control.
    (c) Ventilation of air conditioning systems serving the chemical 
laboratory shall be designed so that air cannot be recirculated into an 
accommodation space.