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Fume Hood Hibernation Standard Operating Procedure

Fume hood hibernation is the temporary shutdown of a hood that is not being used and will not be for at least 3 months. The intent is to reduce energy usage of ducted fume hoods and the institutional carbon footprint. This procedure outlines the specific tasks to complete this operation.


  1. Fume hood hibernation: The temporary shutdown of a fume hood, including the rebalancing supply ventilation and pressurization of the laboratory room.
  2. Fume hood decommission: The mechanical shutdown of a fume hood with the intent of permanent removal.
  3. Fume hood un-hibernation: The return to operation of a fume hood from temporary shutdown.

Criteria for Fume Hood Hibernation

1.    Hibernation of a fume hood cannot reduce ventilation air exchange rates from those determined by the Laboratory Ventilation Specialist in the Environment, Health and Safety (EHS) department. This determination is based on the quantities and types of chemicals, the effectiveness of the ventilation sweeping the lab, and the housekeeping of materials used in the lab.

2.    Hibernating a fume hood cannot cause or exacerbate room temperature issues. This may be determined by the controls technician.

3.    All chemicals and hazardous waste must be removed from bench in fume hood.

4.    Only very small amounts of flammables chemicals, and no corrosive chemicals, can be stored in cabinets underneath. All of these must be in good condition and secured. No incompatible materials can be stored in the same cabinet.


  1. Facilities and Campus Services (FCS) Director of Energy Management

  • Provide financial and programmatic support for the Lab Ventilation Management Program;
  • Consult with EHS regarding laboratory ventilation.

  2. EHS Chemical Hygiene Office

  • Provide programmatic support for the hibernation of fume hoods;
  • Provide an EHS specialist to manage laboratory ventilation.

 3. EHS Laboratory Ventilation Specialist

  • Establish procedures for fume hood commissioning, annual inspections, and hibernation;
  • Provide oversight of training and guidance on fume hood hibernation to EHS staff and controls technicians;
  • Consult with FCS Energy Management department regarding laboratory ventilation;
  • Track fume hood service requests to measure numbers of hoods in hibernation.

  4. FCS Energy and Sustainability Communications Manager

  • Establish procedures for fume hood hibernation;
  • Provide educational outreach to lab population about energy use of fume hoods;
  • Track fume hood service requests to measure numbers of hoods in hibernation.

  5. FCS Energy Management

  • Work with the EHS Laboratory Ventilation Specialist to establish procedures for fume hood hibernation;
  • Track and communicate energy use reductions related to lab ventilation energy projects;
  • Work with the EHS Laboratory Ventilation Specialist to track fume hood service requests to measure numbers of hoods in hibernation;

  6. FCS Central Zone Controls, Trades Superintendent, Zone Managers

  • Provide staffing in the FCS Controls Shop Technician(s) to fill service requests related to fume hood hibernation;
  • Oversee work done by FCS Controls Shop Technicians.

  7. FCS Controls Technician, Energy Conservation Controls Operation (ECCO)

  • Coordinate with University Facility Representative (UFR) and lab occupants for hood shutdown;
  • Schedule and conduct hibernation and un-hibernation of fume hoods;
  • Complete Job Plan and enter results into MAXIMO data base.

  8. FCS Central Zone Project Associate (Maximo Database Administrator)

  • Maintain database information related to fume hood hibernation;
  • Provide Laboratory Ventilation Specialist with access to test results, including building reports and full testing reports;
  • Send out building reports to building coordinator.

   9. University Facility Representative (UFR)

  • Facilitate on-site activities for fume hood hibernation and un-hibernation;
  • Make service requests for fume hood hibernation.

  10. Laboratory Personnel

  • Identify fume hoods that are candidates for hibernation;
  • Coordinate with UFR and FCS controls technician to safely shutdown hood;
  • Inform UFR of need to un-hiberate fume hood.

Procedure Instruction


  • FCS Controls staff that perform ventilation system maintenance must receive Hazard Communication training as well as job specific training.

  • Laboratory personnel must receive training in proper fume hood use. This is provided in Lab Safety training as well as other methods of communication with lab occupants (ventilation assessment and inspections).


  • Chemical Contamination

    • If there are concerns about the chemicals/equipment or contamination in a hood, do not do testing and contact the Laboratory Ventilation Specialist with the hood ID and contact information for that laboratory.


Asset Management

Maximo Standard Operating Procedures

Unit Facility Representative (UFR): Procedure U1b Fume Hood Hibernation-Un-Hibernation

Zone Management: Procedure Z1b Fume Hood Hibernation-Un-Hibernation

  • 1. Enter the Energy Management budget number with additional object code for hood hibernation/ un-hibernation within the service request.
    • • State Building Fume Hood Hibernations: IT-7523684-?????-6470-???-??????????-000147
    • • Endowed Building Fume Hood Hibernations: IT-R614684-?????-6470-???-??????????- 000147
    • Note that the Work Group is (CZ), the Service is (HVAC), and the Crew is (Control). This allows for the ticket to be issued correctly.
  • 2. Upon receipt of service request the UFR must approve it to proceed to the Central Zone Controls in order for the work to be completed
  • 3. Lab Personnel should notify the UFR when the fume hood is to be re- commissioned. A service request to the Central Zone Controls must be issued requesting the hood be brought out of hibernation (un-hibernation).
  • Steps for the Mechanical Shutdown of a Fume Hood

  • 1. Obtain and wear proper PPE: Safety glasses when working in the lab.
  • 2. Survey lab ventilation system for other exhaust sources. If no general exhaust, point exhaust or other hoods are present, hood flow can only be reduced enough to provide exhaust flow for required air changes.
  • 3. Confirm that all chemicals and equipment have been removed from hood. If this is not completed then inform the lab occupants, building coordinator or EHS that this job task cannot be completed until this is done.
  • 4. Take air flow FPM readings, calculate and record CFM, for entry in OneNote before and after hibernating or reducing hood flow.
  • 5. Perform proper steps to decommission hood:
  • 6. Hoods not connected to common header: Secure exhaust fan and damper and install lock out tag out if exhaust fan is to be turned off.
  • 7. Hoods not connected to common header: Secure VAV and make necessary adjustments to mechanical components and/or controls.
  • 8. Place “Do Not Use” sign on sash and physically secure sash closed if requested by facility management.
  • 9. Take pressure/flow reading to make certain space is properly balanced and pressurization is correct. Note: If reheat is the only heat source, supply air may have to be increased.
  • 10. Have BAS graphics edited show fume hood in hibernation.
  • 11. Check BAS and EMCS for alarms generated and have them temporarily taken out of service or tagged to be ignored.
  • 12. Place tag on VAV and fan indicating that the fume hood is in vacant mode. See Appendix A below.
  • 13. Notify appropriate personnel (Building coordinator, General foreperson ECCO group, ECCO Manager) that hibernation sequence has been completed.
  • 14.  Un-Hibernation: Perform process in reverse. Confirm face velocity and negative pressurization of room following steps to return equipment to operation.


  • A report from the Maximo Asset Management database is run periodically.Tracking capabilities:
    • Numbers of fume hood presently in hibernation
    • Length of time hoods remain in hibernation
    • Departmental response to using this energy conservation mechanism

Appendix A

This equipment is connected to a fume hood that is in hibernation.

Hood ID #:
Lab PI:
Point of Contact: