[Code of Federal Regulations]
[Title 30, Volume 1]
[Revised as of July 1, 2002]
From the U.S. Government Printing Office via GPO Access
[CITE: 30CFR33.4]

[Page 153]
 
                       TITLE 30--MINERAL RESOURCES
 
  CHAPTER I--MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR
 
PART 33--DUST COLLECTORS FOR USE IN CONNECTION WITH ROCK DRILLING IN COAL MINES--Table of Contents
 
                      Subpart A--General Provisions
 
Sec. 33.4  Types of dust collectors for which certificates of approval may be granted.

    (a) Certificates of approval will be granted only for completely 
assembled dust-collector or combination units; parts or subassemblies 
will not be approved.
    (b) The following types of equipment may be approved: Dust-collector 
or combination units having components designed specifically to prevent 
dissemination of airborne dust generated by drilling into coal-mine rock 
strata in concentrations in excess of those hereinafter stated in 
Sec. 33.33 as allowable, and to confine or control the collected dust in 
such manner that it may be removed or disposed of without dissemination 
into the mine atmosphere in quantities that would create unhygienic 
conditions.