Laminar Flow Hoods Explained
What Is a Laminar Flow Hood?
A laminar flow hood is a partially enclosed workstation designed to prevent contamination by directing a continuous stream of filtered air across the work surface. The airflow is smooth and unidirectional, which is what classifies it as “laminar.”
These systems protect materials and products within the work area by keeping airborne particles—such as dust, spores, and microbes—out of the sterile zone. However, they do not protect the operator or the surrounding environment.
Typical Applications
- Pouring agar or culture media
- Assembling sensitive equipment
- Weighing fine powders
- Preparing sterile materials
- Conducting pharmaceutical transfers
- Performing clean electronics work
How Laminar Airflow Functions
Air Intake
Ambient air is drawn from the room into the hood.
Filtration
The air passes through a high-efficiency filter—either HEPA or ULPA—removing contaminants down to sub-micron levels.
Airflow & Exhaust
The filtered air then flows in a smooth, consistent stream across the work area.
Air exits toward the operator (horizontal units) or downward toward the work surface (vertical units).
Key factors
When Selecting a Laminar Flow Hood
One of the first decisions when selecting a hood is choosing between a horizontal or vertical airflow configuration. Each design is suited to different laboratory needs, space considerations, and operational tasks.
To ensure compatibility with your lab processes, assess the following specifications:
- Airflow Orientation (Horizontal or Vertical)
- Filtration Type (HEPA vs. ULPA)
- Interior Work Area Dimensions
- Work Surface Material
- Noise Level
- Optional Features
Installation Considerations
Regardless of configuration, installation requires:
1
A flat,
stable surface
2
Standard electrical supply
3
Clearance behind (for horizontal) or above (for vertical)
4
A location free from heavy traffic, airflow disruptions, or drafts
LabBuild Recommendations
Based on typical lab applications
Horizontal Laminar Flow Hoods are ideal for:
- Pouring agar
- Transferring sterile media
- Clean micro-assembly tasks
- PCR setups (non-hazardous)
Opt for a Horizontal Hood if:
- You need steady, front-to-back airflow
- Your work involves plate pouring or media preparation
- You’re using larger instruments
- You prefer more open elbow room
Vertical Laminar Flow Hoods are ideal for:
- Space-constrained environments
- Precision weighing or measuring
- Light manufacturing or electronics
- Assembly with upright instruments
Opt for a Vertical Hood if:
- Bench space is limited
- You want airflow directed away from your face
- You use tall lab equipment
- You need a compact and ergonomic setup
You ask, we answer
Find answers to common questions concerning vertical and horizontal laminar flow hoods. If you have questions that aren’t covered here, contact us today!
No. They are designed to protect the materials inside the hood—not the user. For biohazard or chemical protection, use a certified BSC.
Most labs perform certification annually. Facilities following GMP or other standards may require certification every 6 months.
Typically, a HEPA filter (horizontal units) or ULPA filter (for high-purity use) is mounted behind or above the workspace, depending on airflow type.
A clean bench ensures only product protection, while a BSC safeguards the operator, product, and the lab environment from biological or chemical exposure.
No. Laminar flow hoods are not ventilated for chemical fumes or vapors. Use a fume hood or BSC appropriate for chemical safety.