Siemens Building Technologies, Inc. ED&G 100 Design Project Fume Hood Face Velocity Control Spring 2004

Siemens Building Technologies, Inc. Tonight’s Agenda  Functionality of a fume hood  Types of fume hoods  Laboratory Room Airflow Control  Fume hood face velocity calculation  Fume hood testing methods  Safety Concerns  Design Project Recap  Questions

Siemens Building Technologies, Inc. Fume Hoods What is a fume hood? How does a fume hood work?

Siemens Building Technologies, Inc. Some Common Types of Fume Hoods

Siemens Building Technologies, Inc. Laboratory Room Control

Siemens Building Technologies, Inc. Fume Hood Control Constant Air Volume Fume Hood

Siemens Building Technologies, Inc. Fume Hood Control Variable Air Volume Fume Hood

Siemens Building Technologies, Inc. Fume Hood Control Fume Hood Cost Savings Example  6 foot wide fume hood  1250 CFM maximum exhaust airflow  Cost to operate: Constant Volume Hood - $ $6250 Variable Volume Hood - $ $2500

Siemens Building Technologies, Inc. Components of a Bench Top Fume Hood

Siemens Building Technologies, Inc. Fume Hood Sash  What is a sash?  What are the different configurations for the sash?  What happens when a sash is moved?

Siemens Building Technologies, Inc. Fume Hood Face Velocity  What is face velocity?  How is face velocity calculated?

Siemens Building Technologies, Inc. Average Value for Face Velocity  What is the average value for face velocity?  What happens if the face velocity is above or below 100 (ft/min)?

Siemens Building Technologies, Inc. Average Face Velocity Recommendations ACGIH NIOSH ANSI (Standard Z ) NFPA OSHA NIH SEFA 80 to 100 fpm 100 to 150 fpm 80 to 120 fpm 60 to 100 fpm 100 fpm

Siemens Building Technologies, Inc. Fume Hood Testing – ASHRAE 110 Standard 1.Measurements of Face Velocity 2.Air Flow Visualization Test (Smoke Test) 3.Tracer Gas Containment Test

Siemens Building Technologies, Inc. Measurements of Face Velocity

Siemens Building Technologies, Inc. Airflow Visualization Test (Smoke Test)

Siemens Building Technologies, Inc. Tracer Gas Containment Test

Siemens Building Technologies, Inc. Tracer Gas Test - Video Simulation

Siemens Building Technologies, Inc. Laboratory Safety Concerns  Fume hoods are the primary protection of the lab occupant  Labs can contain biomedical wastes, toxic or hazardous chemicals, explosive substances, radioactive isotopes, etc.

Siemens Building Technologies, Inc. Some Safety Guidelines and Regulations ANSI/AIHA Z9.5, “Laboratory Ventilation” OSHA Laboratory Standard 29CFR NFPA 45 ASHRAE TC 9-10 Public Works Canada MD FDA Validation Protocols Local Building Codes

Siemens Building Technologies, Inc. Visual Fume Hood Reminders

Siemens Building Technologies, Inc. Design Project Recap Goal: Design a method for calculating the open fume hood face area (sash opening) and maintaining a safe face air velocity at all times and with all sash positions. Critical Design Requirements: 1.A materials cost goal <$ Adaptable for various fume hood and sash configurations. 3.Must be “maintenance-friendly” – must be able to access equipment for preventative care, problems, etc. 4.Must be able to be installed in less than minutes. 5.Must not interfere in any way with the day-to-day operations of the fume hood user. 6.Must be stable, repeatable, and accurate to be able to be used at FDA- regulated sites (e.g. pharmaceuticals, etc.) 7.Must not contribute to overall laboratory noise (both from the fume hood exhaust airflow control system and the fume hood sash sensing system).

Siemens Building Technologies, Inc. Questions? Good luck on your design projects!