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Revision Log

Light Sources Directorate Policies and Requirements Manual

Number: LS-ESH-PRM-2.4.0
Date: 06/04/10
Revision: 2
Prepared by: L. Stiegler
Approved by: A. Ackerman

 1.0          Purpose

 The purpose of this PRM is to document the policies and requirements for the specific exhaust ventilation systems in place at NSLS.

 2.0          Gas Cabinets

 There are four gas cabinets in use on the 725 Experiment Floor which are designed to protect workers from exposure to toxic gases.  These gas cabinets are at:

  •  X7B has a local flow alarm and automatic shut off of gas valves (See LS-ESH-0048)

  • X10C has a local flow and gas sensor alarm and automatic shut off of gas valves (See LS-ESH-0075)

  • Common gas cabinet for X18A/B/19A tied into hutch ventilation and local alarms (See LS-ESH-0061)

  • X21 - tied into the laser exhaust ventilation, and the X22B exhaust system, and is alarmed both locally and in Control Room (See LS-ESH-0067).  The switch to control this fan is located on the outside of the X18B hutch wall.

 The ventilation flow rates for each of these are verified annually by the Facility Support group. 

3.0          Nanomaterial HEPA Ventilation

The use of unbound engineered nanomaterials requires HEPA ventilation before exhausting to the outside atmosphere.  In building 725 there are HEPA filtered exhausts in:

  • The nanomaterial hood in Lab Room 1-128,

  • The nanomaterial glove box in Lab Room 1-128,

  • A common exhaust duct for beamlines X18A, X18B, and X19A.  The fan for these beamlines is controlled by a switch on the wall of the X19A hutch.

Each of these systems has a separate HEPA filter.  The HEPA filters in lab Room 1-128 are on an annual maintenance contract.  The HEPA filter for the combined three beamlines is on the roof, and is monitored by a magnehelic gauge on the X19A hutch wall.  All three filters are tested for efficiency annually by Safety and Health Services Division. 

 4.0          Protein Crystallography Hutches

Protein crystallography hutches have an automatic filling system that can potentially release a large amount of liquid nitrogen into an enclosed space and create an oxygen deficient atmosphere.  These hutches are required to have working ventilation fans or systems.  The fan flow is checked on an annual basis by the Facility Support group.  See LS-ESH-0064.

 5.0          Chemical Fume Hoods

Many laboratories have chemical fume hoods to protect workers from inhalation hazards.  The hood flow is checked annually by the Facility Support group.

 6.0          Hutch ventilation systems

Several hutches and beamlines have separate ventilation systems to aid in venting nuisance levels of contaminants from samples and vacuum pumps.  The use of toxic gases is not expected at these beamlines.  Therefore, the failure of a ventilation system would not result in any personnel exposures.   These systems vent directly to the roof of building 725.  Current ventilation systems are at:  X1B, X9, X11A/B, X23A2/23A3, X24C, X27C and the UV floor.  Any request for toxic gas use at these beamlines would be evaluated through the Safety Approval Form, and ventilation flow would be required to be verified prior to use.             

PRM Table of Contents

Document Review Frequency 3 Years

Review signatures on file with master copy of controlled document

Document Number: LS-ESH-PRM-2.4.0

> See NSLS Quality Control Coordinator for original revision and review signatures <

Rev Description Date
1 Original Document 03/30/07
2 Rewrote document to include gas cabinet descriptions, nanomaterial and protein crystallography ventilation requirements and hutch ventilation systems.  Changed "Prepared by" to L. Stiegler. Changed "Approved by" to A. Ackerman. 06/04/10

For information regarding this document contact Lori Stiegler,