Hood Design Workshop: High Performance Hoods

Pam Greenley [email protected]

MIT EHS Office

Hood Design Workshop Warm-Up • Fume Hood evolution • Selection Influence • What is a high performance hood • Hood for today • Group topics • Hood show and tell

Evolution of Laboratory Hoods

By-Pass Hood w airfoils High Performance Hood – improved aerodynamics allow lower face velocity, sash restriction lower exhaust rate

Who Influences Hood Selection • Architect • Project Manager • Mechanical Engineer • Contractor • Energy Manager • Facilities Manager • EHS • Researcher

What is a high performance hood

• Hood that provides excellent containment at 60 to 80 fpm with full-open sash under real lab conditions • Features – Side, bottom, and sash airfoils – Bypass size and location – Fans to assist with air entry – Back baffle design (horizontal and vertical slots, moveable) – Hood depth – Hood duct connection

University of California Irvine Webinar High Performance Fume Hood Study https://www.ehs.uci.edu/programs/energy/LowFlowFumeHoodsWebinar.pdf

Hood for today’s discussion

• General purpose laboratory hood • Can be equipped with monkey bars • Vertical or combination sash • 4, 5, or 6 foot hood • VAV or CV hood

Today’s Topics

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Usability Considerations - Dan Ghidoni

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What should be discussed/specified from a user’s perspective Construction and Maintainability - Greg Muth

– What features and installation steps should be specified to ensure proper construction, assembly, and maintainability

Specifying Design and Operating Parameters -Jim Coogan

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What parameters should be included in the design spec and drawings for proper balancing and commissioning Laboratory Hood Test Methods , Tom Smith

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The who, what, where, and when of hood testing