Horizontal vs Vertical Laminar Flow Hood: How to Choose

What a laminar flow hood does (and does not do)

A laminar flow hood (clean bench) delivers HEPA-filtered, ISO Class 5 air across the work surface to protect the product from contamination. Crucially, it protects the product only — it does not protect the operator or the environment, so it must never be used for hazardous, toxic or infectious materials. For those, use a biosafety cabinet or fume hood (see our laminar flow vs biosafety cabinet guide).

Horizontal laminar flow

Air is HEPA-filtered at the back of the cabinet and flows horizontally toward the operator. This gives excellent, unobstructed product protection and visibility, with no turbulence from the operator’s hands — ideal for media plate filling, electronics, optics and non-hazardous assembly. Because air flows toward the operator, it must never be used with hazardous or biological material. See OPTIGEL and OPTIMUM.

Vertical laminar flow

Air is HEPA-filtered at the top and flows downward onto the work surface. Vertical units fit under lower ceilings, are simpler to duct, and keep filtered air off the operator’s face — a good general choice for aseptic product protection. See IVGEL SPACE, VFL and MINISPACE.

How to choose

Choose horizontal flow for maximum unobstructed product protection on non-hazardous work; choose vertical flow when ceiling height, ducting or operator comfort matter, or when handling taller items. Remember: neither protects the operator or environment.

Frequently Asked Questions

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