LTMW-SOP-1112 - Most Recent Version

LTMW-SOP-1112 Protocol is the test for subsequent evaluations after a baseline has been established under the ASHRAE 110 method. This is the “less rigorous” qualitative test referred to in the most recent version of The ANSI/AIHA Z.5 Standard.


 LTMW-SOP-1112 Protocol is a qualitative review of the critical relationship between fume hoods, lab design and work procedures as observed. Factors that can impact a hoods ability to do its job include:

  • Cross Drafts - Air currents can be directional and have an adverse affect on the hoods ability to provide proper containment.
  • Work Procedures - Proper work procedures are critical to safe operation.
  • Internal Obstructions - Reactions and equipment must be set up in a fashion to permit air movement, which does not interfere with the hoods ability to do its job.
  • Procedures and Reactions - Processes inside of the fume hood can create problems with the hoods ability to properly contain hazards.
  • Thermal Challenge - High heat loads can create leaks and impair containment.
  • Pressurization - Pressure can challenge the hoods ability to provide containment.
  • Response Rate - the response rate of VAV mechanical systems can adversely affect the hoods ability to do its job.
  • Mechanical Systems - a hoods ability to perform is dependent upon the mechanical systems condition and design.

The procedure focuses on CONTAINMENT - the hoods ability to provide protection. While performing test procedures outlined by individual standards we are observing your laboratory and looking for circumstances or items which can impact performance.