29 CFR 1910.1450

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29 CFR 1910.1450 Laboratory Safety Standard
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• Chemical Hoods
• Conventional
• Bypass
• Auxiliary Air Bypass
• Re-circulating/Ductless

• Non-Chemical Hoods
• BioSafety Cabinets
• Laminar Flow Hoods

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Chemical Hood Types
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Unstable Set- Up Flammable and Toxic Atmospheres
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Unsafe Experiment
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Chemical Contamination
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Proper Set Up Brightly Illuminated Clean Apparatu
s 6 Inside Slots Unobstructed
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Unsafe Lab Practice
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Unsafe Lab Practice
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Safe Lab Practice
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Improper Chemical Storage
Restricted Airflow Chemical Escape Incompatible
Chemicals Chemical Contamination
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Proper Chemical Storage Hazard Class Secured Label
ed Dry
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Proper Material Storage
Side or Rear 6 Beyond Sash Maximum 25 Slot
Blockage
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Improper Equipment Storage
Sash Restricted Slot Opening Blocked Airflow
Restricted Limited Protection
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Proper Equipment Storage
Elevate Apparatus Promote Airflow Contain
Contaminants
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Improper Waste Disposal
Unsafe Illegal
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Closed Sash Position
One-Third Opening Chemical Exposure Explosion
Protection Fire Containment
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Open Sash Position
Set Up Tear Down Hazard Absent
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Damaged Sash
Limited Protection Report Damage Repair Before
Using
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Raised Sash (Unattended)
Reduced Air Velocity Fire/Explosion Chemical
Exposure
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Lowered Sash (Unattended)
Increased Air Velocity Contain Fire/Explosion Limi
t Exposure
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Open Lab Door
Unrestricted Traffic Air Turbulence Room
Depressurized Chemical Exposure Fire and Explosion
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Closed Lab Door
Control Foot Traffic Limit Turbulence Room
Pressurized Limit Chemical Exposure Contain Fire
and Explosion Provide Security
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Hood Performance
Ventilation Measurements Various Test
Methods Face Velocity Measurements Sash
Height Hood Contents
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Hood Performance
Ventilation Smoke Flow Patterns Laminar
Flow Turbulence Eddy Currents Back Drafts
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Hood Performance
Certification Approval Caution Information
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Hood Performance
Danger Notice Do Not Use
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Hood Performance
Tissue Paper Ribbon
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Hood Performance
Flow Indicator Static Pressure Acceptable
Range Alarm Mechanism Test Alarms
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Hood Performance
Flow Indicator Air Velocity Acceptable
Range Alarm Mechanism Test Alarms
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Ventilation System Duct Work Fan Exhaust Stack