Table 1 summarizes the descriptive statistics for hood performance in terms of percentage of the recommended ACGIH
and ASHRAE guideline values.
On the basis of the ACGIH
exposure standard for UVR, permissible exposure times for various activities have been found to range from a few seconds for some types of welding arcs to around 15 to 20 minutes for noontime sun exposure (depending on season and latitude).
3] above the level in the outside air concentration (8); and the ACGIH
recommended sampling both the complaint and control areas for comparison (13).
Exposure limits applicable to acute exposure can be based on the excursion limit approach of the American Conference of Governmental Industrial Hygienists (ACGIH
) and on the equality of the OSHA-regulated permissible exposure limit (PEL) and the ACGIH
threshold limit value (TLV).
This system, said Chajet, avoids transparent rulemaking procedures through the use of secret rules established by the ACGIH
Numerical solutions from the proposed equations were compared to solutions from Hemeon and ACGIH
equations for plume area, mean velocity and volumetric flow (ACGIH
, 2004; Hemeon, 1999).
is a highly respected NGO, and its recommendations are based on known science, but it has no force of law.
Appendices include a list of additional resources, pertinent mathematics review, conversion of units, and ACGIH
TLVs and BEIs.
[American Conference of Governmental Industrial Hygienists].
After a 5 year notice period, ACGIH
adopted a 1 PPM TLV for Hydrogen Sulfide, reduced from the former level of 10 PPM.
American Conference of Governmental Industrial Hygienists, 2003 TLVs and BEIs: Threshold Limit Values for Chemical Substances and Physical Agents and Biological Exposure Indices (Cincinnati: ACGIH
, 2003), 15.
The elements or oxides listed in table 1 correspond to the ACGIH
categories located in [TLV Threshold Limit Values for Chemical Substances and physical Agents in the Workroom Environment].