Calculating Exhuast Flow for Fume hoods and BSC

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SUMMARY

The discussion centers on calculating the exhaust flow required for fume hoods in laboratory HVAC systems. The standard airflow rate recommended is typically 105 feet per minute (fpm) across the face of the hood, which is crucial for ensuring safety based on the type of hazards present. The ASHRAE Laboratory Design Guide was referenced as a resource, though it did not provide specific calculations for exhaust flow. Understanding the size requirements of lab users is essential for selecting the appropriate fume hood.

PREREQUISITES
  • Understanding of HVAC system design principles
  • Familiarity with ASHRAE standards and guidelines
  • Knowledge of airflow measurement techniques
  • Awareness of laboratory safety protocols related to hazardous materials
NEXT STEPS
  • Research ASHRAE Laboratory Design Guide for detailed HVAC specifications
  • Learn about fume hood types and their specific airflow requirements
  • Explore airflow measurement tools and techniques for accurate calculations
  • Investigate laboratory safety standards related to exhaust systems
USEFUL FOR

This discussion is beneficial for HVAC engineers, laboratory designers, safety officers, and anyone involved in the design and implementation of laboratory exhaust systems.

tj00343
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Hey guys,
I'm doing a university project where I am designing the hvac system of a lab.
I'm having trouble figuring out how I'm supposed to calculate the exhaust flow required through fume hoods.I know this depends on the type of hazard that is being dealt with in the Lab but my knowledge of the actual processes that will be taking place is limited at best.I downloaded a book (ASHRAE Laboratory Design Guide) and I can't seem to find anything specific in there.That's the best recourse I could find.
Any insight into the topic would be appreciated.
Thank You
 
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For the most part, you select the hood based on the size requirement of the lab users. After that, the full-flow airflow is what the standard and manufacturer says (it's typically 105 fpm across the face).
 

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