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Ventilation Equipment

When installed or modified and at least annually thereafter, fume hoods, fume hood exhaust systems, and laboratory special exhaust systems should be inspected and tested as follows:

  • Visual inspection of the physical condition of the hood interior, sash, and ductwork
  • Measuring device for hood airflow
  • Low-airflow and loss-of-airflow alarms at each hood
  • Face velocity
  • Verification of inward airflow over the entire hood face


Changes in laboratory conditions that might affect hood performance such as system rebalancing and a change in the source of make-up air should trigger an inspection and test.

Deficiencies in hood performance should be corrected or one of the following should apply:

  • The activity within the hood should be restricted to the capability of the hood.
  • The hood should not be used.


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