TITLE:	ES&H Manual
DOCUMENT ID:	6630 Appendix T1 Engineering Controls – Local and Portable Exhaust Systems

1.0 Purpose

Whenever respiratory hazards cannot feasibly be mitigated through material substitution, engineering controls (in the form of local and/or portable exhaust systems) are the preferred methods. This appendix provides how to determine if an engineering control is required; appropriate use parameters; and repair, maintenance, and inspection schedules.

2.0 Scope

This appendix covers the local and portable exhaust systems available at Jefferson Lab.

The following table provides minimum capture velocities required to mitigate a hazard for a typical condition, and the contaminant velocity. (These are representative conditions found at Jefferson Lab, other conditions may apply. Contact Industrial Hygiene if there is a concern regarding your specific condition.)

Table 1: Local/Portable Exhaust

Condition Examples	Contaminant Velocity	Minimum Capture Velocity (feet per minute)
Vapors from degreasing, or soldering	No significant velocity	50–100
Spray paint booths, welding, solvent, and acid work	Low initial velocity	100–200
Spray painting into shallow booths, container filling, and crushing	Significant velocity	200–500
Grinding, and abrasive-blasting	High velocity	500–2000

The process steps for this procedure are performed in coordination with ES&H Manual Chapter 6630 Respiratory Protection Program.

3.0 Responsibilities

NOTE: Management authority may be delegated at the discretion of the responsible manager.

3.1 Anyone at Jefferson Lab

· Request an equipment/area hazard evaluation from Industrial Hygiene if you have concerns regarding air quality.

· Use exhaust systems in accordance with intended condition.

· Submit a Facilities Management Work Request when equipment is not performing up to standards.

3.2 Facilities Management

· Repair exhaust systems as requested and maintain per manufactures recommendations.

· Contact Industrial Hygiene when repair/maintenance activities have been performed.

3.3 Industrial Hygiene

· Recommend appropriate mitigation (including material substitution) for respiratory hazards in accordance with findings from the hazard evaluation.

· Perform and record exhaust system inspections.

4.0 Process Steps

4.1 Determining Need

In accordance with your Task Hazard Analysis, request a hazard evaluation for the work condition.

Flow Chart:

Determine if Exhaust System is Required

If	Then
Material Substitution	Substitute Material. Continue Work
Local Exhaust System Required*	Submit a Facilities Management Work Request. (This could include ES&H Manual Chapter 3110 Facilities Design Review)
Portable Exhaust System Required	Obtain system training. Continue work.
*All local exhaust units are installed by Facilities Management.

4.2 Use of Exhaust System:

4.2.1 Prior to use:

· Read and abide by manufacturers instructions.

· Ensure air flow is adequate for the condition.

· Read the Inspection Label:

o Ensure inspection is valid (within one year of previous inspection) (contact Industrial Hygiene if out of date.)

o Set work up to abide by:

§ appropriate sash height

§ working capture distances

Example Inspection Labels
Chemical Fume Hood Inspection Label	Capture Hood Inspection Label

4.2.2 During use:

Abide by the following controls:

Parameter	Control
Face velocity	· Maintain appropriate sash height or working capture distances. · Maintain the hood sash at the smallest practicable open area. · Use the sash as a protective shield.
Cross drafts	Position material to minimize cross drafts.
Turbulence and/or Dead Spots	Minimize by: · Regulating face velocity · Placing items at least 6-inches from the opening. · Raising bulky objects off the work surface.
Capture velocity	100% capture is required.
Storage	Hoods are not to be used for: · Routine storage or · Evaporation of spent chemicals.
Body Positioning	Keep head and body out of the pathway between contaminant/condition and capture.
Personal Protective Equipment	Dependant on condition. See ES&H Manual Chapter 6620 Personal Protective Equipment Program for more information.

NOTE: If at any time your exhaust system is not functioning adequately:

• Discontinue use.
• Submit a Facilities Management Work Request for repair or maintenance.
• After repairs have been made, contact Industrial Hygiene to ensure adequate air flow.

4.2.3 Inspection

Industrial Hygiene performs the following inspections on exhaust systems:

· Before initial start-up;

· Annually thereafter;

· After any adjustment, modification, or maintenance.

If the Hood:	Then
Passes inspection	· An appropriate hood inspection label is provided.
Does not pass inspection	· The hood is placed out of service. · A Facilities Management Work Request is submitted. · Another inspection is scheduled after repair of unit.

5.0 Reference:

· Industrial Ventilation, A Manual of Recommended Practice – 26th edition

6.0 Revision Summary

Revision 1 – 08/11/2011 – Updated to reflect current laboratory operations.

ISSUING AUTHORITY	TECHNICAL POINT-OF-CONTACT	APPROVAL DATE	EXPIRATION DATE	REV.
ESH&Q Division	Jennifer Williams	08/11/11	Annual Review	1

This document is controlled as an on line file. It may be printed but the print copy is not a controlled document. It is the user’s responsibility to ensure that the document is the same revision as the current on line file. This copy was printed on 8/12/2011.