Design guidelines for exhaust hoods
Technical Note TN 3/85
Document Status
Current
Supplement
Mechanical & Electrical Supplement
Series
Technical Note
Abstract
Treats the effective design of exhaust hoods for local exhaust systems. Notes the increasing importance of effective hood design as concerns air pollution and operating costs. States that recent research work has cast doubt on the accuracy of some of the current design equations. Puts forward revised design equations, which experimental evidence shows are more accurate and consistent that those in current use. The equations are for a range of exhaust hoods using the layout of Table B3.5 in the current CIBSE Guide. Further tables present guidance on the selection of control velocities for pollution capture, the heat transfer rates required for assessing the performance of canopies over hot sources and the effects that side walls and adjacent surfaces have on hood performance. Provides general design hints. Discusses the background to the design information in an appendix.
Subjects
- Fittings and equipment
- Catering equipment
- Building services
- Air conditioning accessories
- Heat extraction systems
- Air conditioning/ventilation
Publisher History
BSRIA was founded in 1956. It is a consultancy, test and research organisation which publishes technical notes and guidance for designers and specifiers of building services.
Information
NBS
NBS has produced specification systems and information products for construction industry professionals for more than 40 years. The National Building Specification is the recognised UK national standard and is used by over 5,000 organisations. NBS is part of RIBA Enterprises Ltd.
Accuris
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