AELAB | Environmental Testing Equipment | Fume Hood

AELAB FH1000(P) ducted fume hood front view

AELAB FH1000(P) Ducted Fume Hood – Polypropylene Laboratory Safety Hood

AELAB Walk-in Fume Hood FH1200 Series – Laboratory Safety Ventilation System

Fume Hood

Introduction

A Fume Hood is a ventilated enclosure that captures and exhausts hazardous fumes, vapors, and particulates to protect users and laboratories. By maintaining controlled airflow and effective containment, fume hoods reduce exposure risks and support compliance in academic, industrial, and pharmaceutical labs.

What Is Fume Hood?

A fume hood (laboratory or chemical fume hood) is a safety device that draws contaminated air away from the operator and either filters and recirculates it (ductless) or exhausts it outside (ducted). Using a sash, baffles, and monitored face velocity, it provides primary protection against VOCs, corrosive gases, and toxic aerosols generated during experiments.

Devices in This Category

Ducted fume hood (external exhaust for hazardous chemicals)
Ductless/recirculating fume hood (carbon/HEPA filtered return)
Walk-in fume hood (large apparatus and pilot-scale setups)
Benchtop fume hood (standard day-to-day use)
HEPA-equipped powder handling hood (particulate control)
Acid-/solvent-resistant lined variants (application-specific)

Technical Features and Specifications

Feature	Details
Face Velocity	Typically 80–120 fpm (feet per minute) for safe containment
Sash	Vertical or combination; adjustable opening (often ≤ 18 in) with position marks
Baffles & Aerodynamics	Internal panels manage uniform airflow and minimize turbulence
Construction Materials	Epoxy-coated steel, stainless steel, or polypropylene work surfaces/liners
Monitoring & Alarms	Airflow monitor with low-flow alarm; optional auto-sash controls
Filtration/Exhaust	Ducted to atmosphere or ductless with carbon/HEPA filtration modules
Certifications	ASHRAE 110 performance test; OSHA/ANSI/AIHA Z9.5; CE, ISO 9001 (manufacturer)
Utilities & Ergonomics	Gas/vacuum fixtures, electrical outlets, spill lip, chemical-resistant worksurface

Benefits

Protects users from toxic, corrosive, and flammable vapors
Reduces fire/explosion risk with proper capture and exhaust
Prevents cross-contamination in sensitive chemical workflows
Supports compliance with OSHA, ANSI/AIHA Z9.5, and SEFA guidance
Improves lab air quality and overall safety culture

Applications and Tests

🔬 Molecular Biology

Preparation/handling of volatile solvents and reagents
DNA/RNA extraction steps requiring organic solvents
Decontamination procedures using chemical agents

🧪 Clinical Diagnostics

Histology/Pathology solvent handling (xylene, formalin)
Cytology stains and fixatives with hazardous vapors
Chemical spill response and neutralization in labs

🏭 Industrial & Food Testing

Acid digestion and wet chemistry for metals analysis
Solvent extraction and sample prep for LC/GC
Cleaning/etching steps in materials and coatings R&D

🌱 Environmental & Agricultural Labs

Pesticide residue extraction with volatile organics
Acid/base digestion for soil and water testing
Preparation of standards and preservatives

Fume Hood vs. Biosafety Cabinet

Aspect	Fume Hood	Biosafety Cabinet
Purpose	Chemical safety & ventilation	Biological safety & contamination control
Airflow/Filtration	Inward capture; ducted exhaust or filtered recirculation	HEPA downflow + HEPA exhaust; inward inflow
Protection	User from chemicals	User, product, and environment
Suitable For	Acids, solvents, corrosives	Pathogens, sterile culture work
Standards	ASHRAE 110, ANSI/AIHA Z9.5, SEFA	NSF/ANSI 49, EN 12469

Expert Tips for Choosing the Right Fume Hood

Match hood type to hazards: ducted for corrosives/solvents; ductless for low-risk with appropriate filters.
Right-size the interior for apparatus and maintain 6 in setback from the face.
Specify low-flow alarms and verify ASHRAE 110 test performance.
Select chemical-resistant liners/worksurfaces suitable for acids or solvents.
Consider energy-saving features (auto-sash, VAV integration) without compromising safety.

Maintenance Best Practices

Inspect and replace filters per schedule (ductless) and verify capture via smoke/fog tests.
Measure face velocity quarterly to bi-annually; keep within 80–120 fpm.
Clean interior/baffles with compatible solvents; prevent residue buildup.
Calibrate airflow monitors annually; document all service events.
Operate with sash at recommended height; keep equipment clear of baffles and slots.

FAQ

Q: How often should a fume hood be tested?
A: At least every 3–6 months or as required by local policies; verify face velocity and containment (e.g., per ASHRAE 110).

Q: Can a ductless fume hood be used with acids?
A: Only with appropriate acid-compatible filters and within manufacturer limits—consult application guidance before use.

Q: What is face velocity and why does it matter?
A: Face velocity is the airflow speed at the hood opening; maintaining ~100 fpm (within 80–120 fpm) ensures effective capture of fumes.