25 October 2004
Figure C-1. NFESC Memorandum to OSHA
DATE: May 13, 1999
Ron Cain, Office of Federal Agency Programs, Occupational Safety and Health
Administration, Washington, DC 20210
John Plummer, Director, Office of Federal Agency Programs, Occupational Safety and
Health Administration, Washington, DC 20210
From: Kathleen M. Paulson, P.E.
Naval Facilities Engineering Service Center
Naval Occupational Safety and Health - Air (ESC 425),
1100 23rd Avenue
Port Hueneme, CA 93043-4370
Commercial:(805) 982-4984, DSN: 551-4984, FAX:(805) 982-1409
Web Page: http://www.nfesc.navy.mil/enviro/esc425/NoshArBr.htm
INDUSTRIAL VENTILATION FLOW RATES IN AIRCRAFT HANGARS
We appreciate your offer to revisit the OSHA standard interpretation you provided to the
Department of the Navy, Office if the Assistant Secretary, (Installations and Environment) regarding
spray painting in aircraft hangars. See Enclosures (1) and (2). When we tried to apply the
interpretation that you provided to us dated April 8, 1997, we discovered discrepancies in our
characterization of the processes performed in Navy Final Finish and Corrosion Control Hangars.
Enclosure (3) defines the operations performed in each of the various level hangars.
Our questions are:
What is your definition of a production spray finishing operation?
How do you characterize the five operational levels of hangars discussed in Enclosure 3?
What airflow rate criteria is required for each of the five levels?
If 100 cubic feet per minute per square foot of cross-sectional area is required for any of the
five operational levels, please define the term cross-sectional area. Is it:
a) Area of the exhaust filter bank?
b) Area of the exhaust filter bank?