Archrock (AROC) 8-K Departure of Directors or Certain Officers

Exhibit 99.1

October 24, 2011

Board of Directors
Exterran Holdings, Inc.
16666 Northchase Drive
Houston, Texas 77060

Gentlemen:

This letter is to notify you that I hereby resign from the Board of Directors of Exterran Holdings, Inc. (the “Company”) and as President and Chief Executive Officer of the Company, effective October 31, 2011.

Sincerely,
 

/s/ Ernie L. Danner  

Ernie L. Danner