STANDARDS FOR THE DESIGN, CONSTRUCTION, MAINTENANCE AND USE OF LABORATORY FUME HOODS

Authored by:
Chemical Hazards Use Committee &
The Department of Environmental Health and Safety
at the University of Massachusetts, Amherst
November 1998

ALL LABORATORY EXHAUST VENTILATION SYSTEMS DESIGNED, CONSTRUCTED, MAINTAINED, AND USED AT THE UNIVERSITY OF MASSACHUSETTS AT AMHERST SHALL COMPLY WITH THE SPECIFICATIONS AND STANDARDS SET FORTH IN THIS DOCUMENT

POLICY

GOAL

INTRODUCTION

FUME HOOD DESIGN AND CONSTRUCTION

• HOOD PURCHASE SPECIFICATIONS AND EVALUATIONS
  
• FACE VELOCITY
  
• FACE VELOCITY MONITORING
  
• SUPPLY AIR
  
• VARIABLE AIR VOLUME FUME HOODS (VAV)
  
• EXHAUST STACK DISCHARGE AND EXIT VELOCITIES
  
• RECIRCULATING HOODS
  
• SPECIAL LABORATORY FUME HOODS
  

TESTING FUME HOOD EXHAUST SYSTEMS AND BIOLOGICAL SAFETY CABINETS

USE OF LABORATORY HOODS

DECONTAMINATION AND REMOVAL OF FUME HOOD SYSTEMS OR BIOLOGICAL SAFETY CABINETS

CONTRACTORS WORKING WITH FUME HOODS AND ASSOCIATED FANS AND DUCTWORK

APPENDICES

1. PUBLICATIONS
   
2. DEFINITIONS
   
3. PROCEDURES FOR TESTING NEW OR RENOVATED FUME HOOD SYSTEMS
   
4. PROCEDURES FOR TESTING ESTABLISHED FUME HOOD SYSTEMS
   
5. RESPONSIBILITIES FOR THE PROPER OPERATIONAL USE OF FUME HOODS
6. EH&S NOTIFICATION OF "OUT OF SERVICE" FUME HOOD SYSTEM

POLICY

Laboratory exhaust ventilation systems designed, constructed, maintained, and used at the University of Massachusetts at Amherst shall comply with the specifications and standards set forth in this document and in the publications listed (see Appendix A). A failure to meet these standards shall be referred to the Chemical Hazards Use Committee.

New or renovated fume hood systems will be tested using the Procedures for Testing New or Renovated Fume Hood Systems (Appendix C). Fume hood systems in new or renovated laboratories that do not meet the testing criteria and specifications will not be accepted for use by Environmental Health and Safety and the University of Massachusetts at Amherst.

Established fume hood systems will be tested using the Procedures for Testing Established Fume Hood Systems (Appendix D ). When a fume hood fails to meet acceptable performance requirements the hood will be declared out of service. Fume hood systems that do not meet these requirements must not be used. These systems will be evaluated by Physical Plant and if necessary, Facilities and Planning. See Appendix E for Responsibilities for the Proper Operation and Use of Fume Hoods.

GOAL

The intention of this document is to set a standard for the design, construction, maintenance, and use of laboratory ventilation in order to maintain acceptable air quality in the laboratory building and surrounding areas. This standard outlines criteria for stack heights, exhaust exit velocities, and design considerations that shall be considered and implemented at the University of Massachusetts at Amherst. This document together with design standards established by Facilities and Planning will determine requirements for laboratory exhaust ventilation systems. These requirements do not preclude adherence to good engineering practice and the Massachusetts Building Code and standards referenced therein. These requirements will be included in contract specifications for all future contracts submitted by the University of Massachusetts at Amherst. The University will only accept bids on future contracts which meet these specifications.

INTRODUCTION

This standard will concentrate on the aspects of fume hood system design and operation that are critical to protecting the health and safety of faculty, staff, students, and visitors and also minimizing nuisance odors. Properly designed systems function to capture contaminants from the work area and disperse them in the outside environment. Exhaust stacks function to release contaminants from the inside of a building in order to minimize contaminant reentrainment. The critical design aspects of fume hood systems that are discussed in this document are: the quality of the fume hood enclosure, the quality and quantity of supply air provided to the fume hood, face velocity of the fume hood, exhaust stack height, exit velocity of air being exhausted from the stack. In addition, effluent dispersal is contingent upon factors such as exhaust stack / air intake separation, stack height, stack height plus momentum, topography of the building and surrounding environment, and wind dynamics.

Although system performance depends heavily on the above design elements it must be noted that the fume hood performance in a room is affected by room layout and supply air distribution. System performance depends on the fan and duct layout as well as fan type and discharge conditions. These issues are dealt with in detail in the mechanical design standards developed by Facilities Planning.

FUME HOOD DESIGN AND CONSTRUCTION

HOOD PURCHASE SPECIFICATIONS AND EVALUATIONS

A fume hood that is appropriate for the purpose should be chosen. General guidelines on types of hoods and their application are presented in the Industrial Ventilation Manual (most current edition).

Laboratory fume hoods and associated exhaust ducts should be constructed of non-combustible, nonporous material that will resist corrosion. They should be equipped with vertical or horizontal sashes that can be closed, air foils built into the fume hood at the bottom and the sides of the sash opening, and baffles to attain a uniform face velocity under different conditions of hood use. Combination horizontal and vertical sashes shall be provided unless special conditions dictate otherwise. Additionally, recognized good design and construction features are listed in ANSI/AIHA Z9.5 1992.

Fume hoods should be tested before a hood leaves the manufacturer using the ANSI/ASHRAE 110-1995 standard, Method of Testing Performance of Laboratory Fume Hoods". ). All new hoods shall meet the ANSI/ASHRAE requirements for Class 1 hoods including a tracer gas performance of AM(as manufactured) 0.05(parts per million) or better at a tracer gas release rate of 4.0 Liters per minute. Documentation shall be provided with the results of the test. Performance is measured by specific tests:

1. Flow visualization,
2. Face velocity measurements,
3. Test method for Variable-Air -volume (VAV) Fume Hoods,
4. VAV Response Test , and
5. Tracer gas containment .

Flow visualization qualitatively tests a hood's ability to contain vapors. This test consists of a small local challenge (use of a smoke tube), and a gross challenge (use of a smoke candle or smoke generator) to the hood. Smoke is released in the hood to visually determine if a hood or associated duct work leaks as it is actually used.

Face velocity measurements determine the average velocity of air moving perpendicular to the hood face. The measurement is usually expressed in feet per minute (fpm). Face velocities will often provide information concerning the fume hood's ability to properly control contaminants.

A tracer gas leak test will quantitatively determine if the fume hood is properly containing contaminants. A tracer gas is released in the hood and a continuous-reading instrument is positioned outside the hood to monitor for the escape of the tracer gas. The preferred tracer gas is sulfur hexafluoride (SF6 ).

FACE VELOCITY

Each variable air volume hood shall maintain an average face velocity of 90-110 fpm at the maximum allowed hood opening. Each constant volume hood shall maintain an average face velocity of 90-110 fpm in the half open position. A written request for an exception to this requirement must be submitted to EH&S and will be granted only by EH&S. Face velocity measurements are to be made with a recently calibrated mechanical or electrical anemometer . Measurements should be made of 1 square foot areas across the face of the hood and no single face velocity measurement should be more than plus or minus 20% of the average. For further information, refer to ANSI/ASHRAE 111-1988, Practices for Measurement, Testing, Adjusting, and Balancing of Building Heating, Ventilation, Air-Conditioning, and Refrigeration Systems.

FACE VELOCITY MONITORING

All fume hoods shall include some means of monitoring face velocity with a visual and audio alarm.

SUPPLY AIR

The proper volume, distribution, and quality of supply air shall be provided to laboratories containing fume hoods. ANSI/AIHA Z9.5 1992 and ANSI/ASHRAE 62 provide these standards. Make up air (replacement air) should be equal to at least 95% of the volume exhausted from the laboratory. This air shall not be recirculated from other laboratory areas. Although laboratory supply air seldom requires air cleaning, ASHRAE ( HVAC Application Handbook 1995) provides technical information for the reduction of contamination from atmospheric dust and dirt.

Air supply systems for rooms containing chemical fume hoods shall not create room air drafts at the face of any hood greater than one half (and preferably one third) the face velocity of the hood. For most laboratory hoods, this means 50 fpm or less terminal throw velocity at 6 feet above the floor. ACGIH's "Industrial Ventilation - A Manual of Recommended Practice" provides design criteria to help achieve these standards

VARIABLE AIR VOLUME FUME HOODS

Variable-air volume fume hoods shall be installed unless accepted design practice dictates otherwise. A VAV hood is one that is fitted with a face velocity control which varies the amount of air exhausted from the fume hood in response to the sash opening to maintain a constant face velocity. These hoods produce an acceptable face velocity over a relatively large sash opening and also provide significant energy savings by reducing the flow rate from the hood when it is closed.

EXHAUST STACK DISCHARGE AND EXIT VELOCITIES

Exhaust stacks shall be designed and built to prevent recirculation of contaminated air from the fume hood exhaust system into the fresh air supply of the facility or adjacent facilities. The effluent exhaust shall escape the building envelope. The stack shall also provide significant effluent dispersal so that effluent downwash does not occur at ground level. They shall be designed and built with the latest applicable ASHRAE standards and using ANSI/ASHRAE Z9.5. ASHRAE 1997 Fundamentals Handbook and the publication "Laboratory Stack Height Determination and Evaluation Methods" present three methods for specification and evaluation of stack heights from laboratory hood exhaust fans.

Effluent discharge shall be:

1. direct to the atmosphere (unless treated for recirculation).
2. conform to federal, state, and local air emission regulations.
3. released so that reentry of effluent from the discharging building or a surrounding building is reduced to allowable concentrations inside of the building.(Allowable concentrations shall be determined using information on the nature of the contaminants to be released, recommended industrial hygiene practice, and applicable safety codes.)

Exhaust discharge from stacks shall:

1. be in a vertical up-draft direction at a minimum of 10 ft above adjacent roof lines and located with respect to surrounding air inlets as to avoid contaminant reentry.
2. have a minimum exit velocity of 3000 fpm.

RECIRCULATING HOODS

Recirculating or ductless fume hoods are not permitted for the removal of chemical contaminants.

SPECIAL LABORATORY FUME HOODS

ANSI/AIHA Z9.5 1992 provides standards for non-traditional laboratory fume hoods. These hoods include perchloric acid fume hoods, walk-in fume hoods, and glove boxes. ACGIH's Industrial Ventilation Manual provides information on perchloric acid fume hoods, biological safety cabinets, and glove boxes. All class II biological safety cabinets must meet the National Sanitation Foundation Standard Number 49 for Class II Biohazard Cabinetry for design, manufacturing and testing.

TESTING FUME HOOD EXHAUST SYSTEMS AND BIOLOGICAL SAFETY CABINETS

All new and renovated fume hoods will be tested after installation and before use. See Procedures for Testing New or Renovated Fume Hoods (Appendix C)

All established fume hoods will be tested annually or more often if problems occur. See Procedures for Testing Established Fume Hoods (Appendix D).

The operational integrity of a new biological safety cabinets (BSC) must be validated by certification before it is put into service or after a cabinet has been repaired or relocated. In addition, it will be the responsibility of the faculty member to have BSC tested and certified annually. Certification will be performed by an accredited Biohazard Cabinet Field Certifier using National Sanitation Foundation (NSF)Standard Number 49 for Class II Biological Safety Cabinets.(See Massachusetts Higher Education Consortium list).

USE OF LABORATORY HOODS

All personnel using fume hoods, biological safety cabinets, and glove boxes will follow the policies and procedures outlined in University of Massachusetts/Amherst Laboratory Health and Safety Manual. ANSI/AIHA Z9.5 1992 and ACGIH's Industrial Ventilation Manual provide additional work practices to minimize emissions and employee exposure when working with fume hoods.

CDC/NIH's publications Biosafety in Microbiological and Biomedical Laboratories and Primary Containment for Biohazards: Selection, Installation, and Use of Biological Safety Cabinets provide additional information on the use of biological safety cabinets. Horizontal and vertical laminar flow clean benches are not biological safety cabinets. These clean benches provide a very clean environment for the manipulation of non-hazardous materials and can be used for activities such as the dust-free assembly of sterile equipment or electronic devices. Since the operator sits in the downstream exhaust from the clean bench, this equipment must never be used for the handling of toxic, radioactive, infectious, or sensitizing materials.

DECONTAMINATION AND REMOVAL OF FUME HOOD SYSTEMS OR BIOLOGICAL SAFETY CABINETS

When a fume hood is scheduled for removal, the hood, fan, and associated ductwork must be tested for the presence of radioactive materials and hazardous chemicals eg. perchlorate salts, asbestos, oxidizers, sulfides, cyanides, lead, and mercury. EH&S will determine the need for testing and decontamination of the hood and ductwork. If decontamination is necessary, fume hood(s) must be decontaminated before removal. Biological safety cabinets must be decontaminated before removal or a move to a different location. Costs associated with testing and/or decontamination shall be included in the total project cost.

CONTRACTORS WORKING WITH FUME HOODS AND ASSOCIATED FANS AND DUCTWORK

Before beginning work, all contractors and subcontractors, involved with a renovation project involving fume hoods and associated fans and ductwork must consult with EH&S for recommendations for training and personal protective equipment for their employees.

APPENDICES

A. PUBLICATIONS

ACGIH. "Industrial Ventilation- A Manual of Recommended Practice." American Conference of Governmental Industrial Hygienists, Ed. 22, 1995, (or the most recent edition)

ANSI/ASHRAE 110-1995 "Method of Testing Performance of Laboratory Fume Hoods." (1995). (or the most recent edition)

ANSI/ASHRAE 111-1988, Practices for Measurement, Testing, Adjusting, and Balancing of Building Heating, Ventilation, Air-Conditioning, and Refrigeration Systems, (or the most recent edition)

ANSI/AIHA. Z9.5 1992 "American National Standard for Laboratory Ventilation." American Industrial Hygiene Association. 1992. (or the most recent edition)

ASHRAE. "1997 Handbook- Fundamentals Volume" . American Society of Heating and Air-Conditioning Engineers, Inc. 1997.(or the most recent edition)

ASHRAE. "1995 ASHRAE Handbook- Heating, Ventilating, and Air-Conditioning Applications." American Society of Heating and Air-Conditioning Engineers, Inc. 1995. (or the most recent edition)

Biosafety in Microbiological and Biomedical Laboratories. U. S. Department of Health and Human Services. U. S. Government Printing Office. Washington, D. C. 1993 (or most recent).

Laboratory Stack Height Determination and Evaluation Methods - Possible Additions to the ANSI/AIHA Z9.5 Standard on Lab Ventilation. Ratcliff, M. and Sandru, E. ASHRAE Winter Meeting. 1998

NFPA. Standard on fire protection for laboratories using chemicals. Standard 45. National Fire Protection

Primary Containment for Biohazards: Selection, Installation, and Use of Biological Safety Cabinets. U. S. Department of Health and Human Services. U. S. Government Printing Office. Washington, D. C. 1995 (or most recent).

Prudent Practices in the Laboratory: Handling and Disposal of Chemicals. Committee on Prudent Practices for Handling, Storage, and Disposal of Chemicals in Laboratories. National Academy Press, Washington, D.C. 1995 (or the most recent edition).

Facilities/Planning/Physical Plant Design Standards. To be published.

B. DEFINITIONS

building envelope: the three-dimensional space surrounding a building containing the building's makeup air.

downwash: pollutants discharged from an exhaust stack that travel towards the ground due to insufficient discharge velocities, poor wind dispersion, and physical obstructions.

exhaust air: the air that is removed from an enclosed space and discharged into atmosphere (ANSI/AIHA Z9.5, 1992).

face velocity: average velocity of air moving perpendicular to the hood face, usually expressed in feet per minute (fpm) or meter per second (m/s) (ANSI/ASHRAE 110, 1995)

glove box: a boxlike structure provided with tight-closing doors or air locks, armholes with impervious gloves sealed to the box at the armholes, and exhaust ventilation to keep the interior of the box at negative pressure relative to the surroundings (ANSI/AIHA Z9.5, 1992).

hood face: the plane of minimum area at the front portion of a laboratory fume hood through which air enters when the sash(es) is (are) fully opened, usually in the same plane as the sash(es) when sash(es) is (are) present (ANSI/ASHRAE 110, 1995)

internal condensation: fumes and vapors that condense into liquids inside of the exhaust stack.

laboratory fume hood: a boxlike structure enclosing a source of potential air contamination, with one open or partially open side, into which air is moved for the purpose of containing and exhausting air contaminants, generally used for bench-scale laboratory operation but not necessarily involving the use of a bench or a table (ANSI/ASHRAE 110, 1995)

lpm: liters per minute (ANSI/ASHRAE 110, 1995)

makeup air: outside air drawn into a ventilation system to replace exhaust air (ANSI/AIHA Z9.5, 1992). Makeup air MUST always be provided when any exhaust system is designed and installed.

perchloric acid hood: a fume hood constructed with water wash so it is safe for use with perchloric acid or other reagents that might form flammable or explosive compounds with organic materials of construction (ANSI/AIHA Z9.5, 1992).

recirculation: air withdrawn from a space, passed through a ventilation system, and delivered again to an occupied space (ANSI/AIHA Z9.5, 1992).

reentry: The flow of contaminated air that has been exhausted from a space back into the space through air intakes or openings in the walls of the space (ANSI/AIHA Z9.5, 1992).

replacement air: see makeup air

return air: air being returned from a space to the ventilation fan that supplies air to a space (ANSI/AIHA Z9.5, 1992).

special purpose hood: an exhaust hood, not otherwise classified, for a special purpose such as- but not limited to - capturing gases from equipment such as atomic absorption, gas chromatographs, liquid pouring or mixing stations, and heat sources (ANSI/AIHA Z9.5, 1992).

variable air volume fume hood: a fume hood designed so the exhaust volume is varied in proportion to the opening of the hood face by changing the speed of the exhaust blower or by operating a damper in the exhaust hood (ANSI/AIHA Z9.5, 1992).

velocity: speed and direction of motion (ANSI/AIHA Z9.5, 1992).

walk-in hood:a fume hood designed to be floor mounted with sash and/or doors for closing the open face (ANSI/AIHA Z9.5, 1992).

C. PROCEDURES FOR TESTING NEW OR RENOVATED FUME HOOD SYSTEMS

Applicability: This test is to be conducted when new hoods are installed or when existing hoods are included as part of a significant renovation as a condition of acceptance. In addition tests will be conducted annually or whenever a significant change is made to the operating characteristics of the hood. Tests to be performed include face velocity measurements and containment tests.

Test conditions

1. General room ventilating systems, both supply and exhaust, including fume hood exhaust, must meet Facilities Planning Design Specifications and shall be in full normal operation. Airflow systems in the laboratory shall be properly balanced and commissioned prior to this test. This includes calibration of airflow controls, calibration of automatic temperature controls, balance of supply air, etc. (Prudent Practices for Handling Hazardous Chemicals in Laboratories, 1995 and ANSI/ASHRAE 110-1995). Laboratories must be under negative pressure relative to corridor unless special design conditions prevail.
2. Hoods are tested in fully open position, half-open position, and 25% open position.
3. All other hoods in the same room are in half-open position.
4. All other hoods on the same floor exhaust system are in half-open position.
5. The hood being tested should be empty.
6. The doors to the laboratory will be closed.
7. When adjustments are made to hood sashes, supply and exhaust air in the room will be allowed to stabilize before testing is done.
8. Hood monitor is calibrated and not in alarm.

Determination of Average Face Velocity for Variable Air Volume (VAV)Hoods

1. The open face of the hood shall be divided into imaginary rectangles of equal area approximately 1 square foot and velocity shall be measured in each rectangle.
2. Instruments used: Shortridge micromanometer with velgrid
3. Average the readings to determine average face velocity
4. Note reading of face velocity on Shortridge.
5. Average face velocity must be 90-110 fpm at maximum allowed hood opening. Maximum opening is the point above which the face velocity deteriorates below 90 fpm.
6. Shortridge readings must be within + 20% of the average face velocity.
7. Face velocities will also be measured at the one half and one quarter open positions. The average face velocities at these openings should be + 10% of the average at the fully open position.

Determination of Average Face Velocity for Constant Air Volume Hoods

1. The open face of the hood shall be divided into imaginary rectangles of equal area approximately 1 square foot and velocity shall be measured in each rectangle.
   Instruments used: Shortridge micromanometer with velgrid Average the readings to determine average face velocity
2. Note reading of face velocity on Shortridge.
3. Average face velocity must be 90-110 fpm at the one-half open position.
4. Shortridge readings must be within + 20% of the average face velocity.

Smoke Testing To Determine Direction of Airflow and Air Turbulence and Contaminant Reentry

1. Using a smoke tube, puff smoke 6 inches within the face of the hood around the outside edge of the opening. Determine direction of smoke flow. If visible fumes flow out of the front of the hood, make necessary adjustments.
2. Ignite a smoke candle in the hood and visually observe if there is leakage of smoke from the ductwork or if smoke is being drawn back into building or surrounding buildings.

Conditions For Passing Hoods

• General room ventilating systems, both supply and exhaust, including fume hood exhaust shall be in full normal operation.
• Hood must have an acceptable face velocity and must pass the smoke testing.
• No leakage of exhaust from ductwork and no reentry of hood exhaust into buildings

D. PROCEDURES FOR TESTING ESTABLISHED FUME HOOD SYSTEMS

Applicability: This test is to be conducted annually to check the performance of established fume hoods or whenever a significant change is made to the operating characteristics of the hood. Tests to be performed include face velocity measurements and containment tests.

Test conditions

1. General room ventilating systems, both supply and exhaust, including fume hood exhaust shall be in full normal operation. Laboratories must be under negative pressure relative to corridor unless special design conditions prevail.
2. Hoods are tested in fully open position, the half- open position, and 25% open position.
3. All other hoods in the same room are in the half-open position.
4. All other hoods on the same floor exhaust system are half-open position.
5. The hood being tested must be empty.
6. The doors to the laboratory will be closed.
7. When adjustments are made to hood sashes, supply and exhaust air in the room will be allowed to stabilize before testing is done.
8. Hood monitor is calibrated and not in alarm.

Determination of Average Face Velocity for Variable Air Volume (VAV)Hoods

1. The open face of the hood shall be divided into imaginary rectangles of equal area approximately 1 square foot and velocity shall be measured in each rectangle.
2. Instruments used: Shortridge micromanometer with velgrid
3. Average the readings to determine average face velocity
4. Note reading of face velocity on Shortridge.
5. Average face velocity must be 90-110 fpm at maximum allowed hood opening. Maximum opening is the point above which the face velocity deteriorates below 90 fpm.
6. Shortridge readings must be within + 20% of the average face velocity.
7. Face velocities will also be measured at the one half and one quarter open positions. The average face velocities at these openings should be + 10% of the average at the fully open position.

Determination of Average Face Velocity for Constant Air Volume Hoods

1. The open face of the hood shall be divided into imaginary rectangles of equal area approximately 1 square foot and velocity shall be measured in each rectangle.
2. Instruments used: Shortridge micromanometer with velgrid
3. Average the readings to determine average face velocity
4. Note reading of face velocity on Shortridge.
5. Average face velocity must be 90-110 fpm at the one-half open position or as a minimum at the operational position of 14 inches.
6. Shortridge readings must be within + 20% of the average face velocity.

Smoke Testing To Determine Direction of Airflow, Air Turbulence, and Reentry of Contaminants

• Using a smoke tube, puff smoke 6 inches within the face of the hood around the outside edge of the opening. Determine direction of smoke flow. If visible fumes flow out of the front of the hood, make necessary adjustments.

Additional Smoke Testing to Determine Reentrainment

This testing will be conducted whenever a significant change is made to the fume hood system or if problems have been noted.

• Ignite a smoke candle in the hood and visually observe if there is leakage of smoke from the ductwork or if smoke is being drawn back into building or surrounding buildings.

Conditions For Passing Hoods

• General room ventilating systems, both supply and exhaust, including fume hood exhaust shall be in full normal operation.
• Hood must have an acceptable face velocity and must pass the smoke testing.
• There must be no leakage of exhaust from ductwork and no reentry of hood exhaust into buildings

E: RESPONSIBILITIES FOR THE PROPER OPERATIONAL USE OF FUME HOODS

Environmental Health and Safety

• Inspects the entire fume hood operating systems including the fume hood, associated duct work, exhaust blowers, and stacks
• Places a sticker on fume hoods with average face velocity if the hood operating systems "PASS"
• Places a "DO NOT USE" sign on the hood sash if the hood operating system does "NOT PASS"
• Puts in a work order on behalf of the department head to Physical Plant for repair
• Notifies the Department Head, Department Health and Safety Coordinator, Physical Plant, and Facilities Planning of any hoods which are placed "OUT OF SERVICE"

Physical Plant and Facilities Planning

• Make all necessary repairs/modifications, in a timely manner, to the fume hood operating system, and any associated equipment which affects the fume hood operating system in order to make the entire system safe to use
• Notify Environmental Health and Safety (EH&S)after all repairs/modifications are completed. EH&S will then retest the system.
• Notify EH&S on a monthly basis in writing as to the status of repair/replacement of fume hoods based on work orders/work requests submitted.

Department Head

• Ensure that any fume hoods which are placed "OUT OF SERVICE" will not be used until notified by EH&S that the hood can be used.
• Ensure that repairs/modifications are completed in a timely manner to any fume hoods which have been placed "OUT OF SERVICE"
• Notify EH&S and Physical Plant of any fume hoods which are not operating properly

Personnel Using Fume Hoods

• Follow all safety and health procedures specified in the Laboratory Health and Safety Manual and by the faculty supervisor in the laboratory
• Attend all required health and safety training sessions
• Do not use fume hoods which are "OUT OF SERVICE"
• Report fume hoods which are not operating properly, accidents, unhealthy, and unsafe conditions to the faculty supervisor
• Notify faculty supervisor of any pre-existing health conditions that could lead to serious health situations when using a fume hood.

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