Basic Documentation
Table Of Contents
- Introduction
- Applicable Definitions (Alphabetical Listing)
- Laboratory Safety
- Hazard Assessment
- Chemical Hygiene Plan
- Chemical Hygiene Responsibilities
- Fume Hoods
- When Required & Safe Usage
- Gloveboxes:
- Face Velocity
- Face Velocity Setback
- Size & ADA Compliance
- CAV (Constant Air Volume) Bypass
- CAV (Constant Air Volume) Conventional
- VAV (Variable Air Volume)
- VAV Diversity
- Automatic Sash Closure
- Safe Operation of Sashes
- Accessories, Services and Explosion Protection
- Ductless
- Auxiliary Air
- (Special Purpose) Perchloric Acid
- Room Air Cross Currents
- Minimum Exhaust
- Monitoring
- Selection Criteria and Performance Specifications
- Laboratory Design & Fume Hood Implementation
- Maintenance
- Periodic Testing
- Test Procedures
- Signage and Recordkeeping
- Shutdown Procedures
- Evaluating CAV (Constant Air Volume) Systems
- Evaluating VAV (Variable Air Volume) Systems
- Biological Laboratories
- Biosafety Level 1
- Biosafety Level 2
- Biosafety Level 3
- Biosafety Level 4
- Ventilation for Biosafety Level 1
- Ventilation for Biosafety Level 2
- Ventilation for Biosafety Level 3
- Ventilation for Biosafety Level 4, Cabinet Laboratory
- Ventilation for Biosafety Level 4, Suit Laboratory
- Containment Levels - Canada
- Containment Levels and Ventilation Requirements: Canada
- Biological Safety Cabinets and Classifications
- Biosafety Cabinet Applications
- Biosafety Cabinets – Installation and Safe Usage Recommendations
- Biosafety Cabinets – Certification and Safe Usage - Canada
- Biological Safety Cabinet Design, Construction and Performance Requirements
- Biosafety Cabinet Testing
- Ventilation Systems
- Local Ventilation -When Required
- Ventilation Rates for Animal Rooms
- Ventilation Rates for Animal Rooms
- Ventilation Rates for Biological Labs
- Ventilation Rates for Chemical Laboratories
- Ventilation rates for Storage areas
- Room Supply Air
- Supply Air Quality and Filtration
- Room and Duct Pressurization
- Human Occupancy, Room Temperature and Humidity
- Animal Rooms Room Temperature and Humidity
- Load Calculations
- Room Sound Level and Vibration
- Emergency Control Provisions
- Energy Conservation
- Monitoring
- Maintenance
- Periodic Inspection and Testing
- Periodic Inspection and Testing - Canada
- Test Records
- Management
- Exhaust Systems
- Configuration
- Leakage
- Components
- Manifolded Systems
- Air Velocity
- Stack Height and Discharge Location
- Operational Reliability
- Recirculated Air and Cross Contamination
- Materials and Fire Protection
- Commissioning
- Commissioning - Canada
- Referenced Publications
Laboratory Ventilation Codes and Standards
Siemens Industry, Inc. 132
Exhaust Systems
Topic Requirement(s) Commentary
Configuration
California OSHA – Division of Occupational Health & Safety (DOSH) Subchapter 7.
General Industry Safety Orders, Group 16. Control of Hazardous Substances,
Article 107. Dusts, Fumes, Mists, Vapors and Gases
5143. General Requirements of Mechanical Ventilation Systems
(1) The exhaust system shall be so designed, constructed, maintained and operated
as to prevent harmful exposure by maintaining a volume and velocity of exhaust air
sufficient to gather dusts, fumes, mists, vapors or gases from said equipment or
process and to convey them to suitable points of safe disposal, thereby preventing
their dispersion in harmful quantities into the atmosphere of work rooms or other
places where persons are employed.
(2) Exhaust ducts, inlet ducts, and fan plenums shall be so designed, constructed, and
supported as to prevent collapse of the ducts and/or failure of the supporting system.
(3) Exhaust ducts which convey dusts, fumes, and mists shall be provided with
inspection or clean-out doors at intervals not to exceed 12 feet of horizontal running
length for ducts up to 12 inches in diameter, but the distance may be greater for larger
ducts. A clean-out door or doors shall be provided for servicing the fan and, where
necessary, a drain shall be provided.
(4) Two or more operations shall not be connected to the same exhaust system where
the combination of substances removed may constitute a fire, explosion, or chemical
reaction hazard in the duct system.
American National Standard for Laboratory Ventilation ANSI/AIHA Z9.5-2003
5.3 Laboratory exhaust system ductwork shall comply with the appropriate sections of
Sheet Metal and Air Conditioning Contractors National Association (SMACNA, 1995)
standards. Exhaust ductwork shall be designed in accordance with ANSI/AIHA Z9.2-
2001 and Chapter 34 on Duct Design of the ASHRAE 2009 Fundamentals and Section
6-5 of NFPA 45-2011.
Exhaust duct sizes should be selected to ensure sufficiently high airflow velocity to
retard condensation of liquids or the adherence of solids within the exhaust system.
If condensation within the duct is likely, all horizontal duct runs shall be sloped
downward at least 1 inch per 10 feet in the direction of the airflow to a suitable drain or
sump.
Branch ducts shall enter a main duct so that the branch duct centerline is on a plane
that includes the centerline of the main duct. For horizontal main ducts, branch ducts
shall not enter a main duct on a plane below the horizontal traverse centerline of the
main duct. Horizontal runs of branch ducts shall be kept at a minimum.
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