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Hoods Airflow Design

Laminar flow


Air passes through a HEPA filter/fan module positioned above the workstation and flows downward. A sash is often included to shield operator and to sustain the downward laminar flow.

Optimal laminarity requires flow-through work surface (rods or perforations) and/or rear baffling system and sub-surface plenum to minimize surface turbulence.

Horizonal air flow


Air passes through HEPA filter/fan module mounted behind the enclosure and passes forward, towards the operator. Hence, horizontal systems require greater depth than vertical ones.

Workstation does not interfere with laminar flow, but samples on the work surface can create turbulence and backflow.

A sash, which would impede airflow, is generally not included, so air flows directly at the operator.