03 · Lab exhaust & controls

Lab Exhaust Fans

High-plume laboratory exhaust fans for safe dispersion.

Overview

What it does

Flow Dynamics supplies laboratory exhaust fans across the UAE for university, hospital and industrial fume applications. Lab exhaust fans discharge hazardous chemical fumes, radionuclides, and pathogens from fume hoods, biosafety cabinets, and isolation rooms. To stop those contaminants from re-entering the building through fresh air intakes on nearby roofs, lab exhaust fans use a high-plume nozzle design that accelerates the discharge to 15–22 m/s, pushing the fume plume well above roof recirculation zones. The fans are all-welded, chemically resistant, and built for 24/7 operation.

How it works

The working principle

Exhaust from hoods is collected in a manifold plenum, optionally bled with outside bypass air to dilute contaminants. The manifold discharges to a high-plume nozzle on a dedicated exhaust fan, typically an upward-discharge centrifugal with a venturi nozzle at the top. The venturi accelerates the plume to 15–22 m/s, far above the roof eddy zone created by wind hitting the building, so fumes rise and disperse rather than hugging the roof and being pulled into fresh-air intakes. Redundant fans (N+1) guarantee continuous containment during maintenance.

Applications

Where it's used

Typical installations across the UAE and wider Gulf include:

University and research fume hood exhaust
Hospital laboratory and pharmacy exhaust
Pharmaceutical R&D and QC labs
Biosafety level 2 and 3 containment labs
Petrochemical analytical laboratories
Semiconductor process exhaust

Specifications

Technical data

Indicative ranges, exact specifications are confirmed per project on selection.

Discharge velocity	15 – 22 m/s at nozzle
Plume height factor	2–3× physical stack height
Fan construction	All-welded FRP or 316L stainless
Bypass air	Up to 50% dilution ratio
Redundancy	N+1 parallel configuration
Monitoring	VFD with flow and pressure feedback

INFINAIR · KSA Flow Dynamics supplies equipment from this manufacturer. We do not act as authorised representative unless explicitly stated in a specific project supply agreement.

Component teardown

Inside the machine.

Every component, taken apart. Select a marker to identify each part, or open the full teardown.

Lab Exhaust Fans, exploded into its main components

FAQ

Common questions

Why does lab exhaust need a high-plume nozzle?

Wind hitting a building creates a roof eddy zone that pulls low-velocity discharge straight back into fresh-air intakes. A venturi nozzle accelerating the plume to 15 to 22 m/s lifts fumes 2 to 3 times the physical stack height, above the recirculation zone.

FRP or stainless construction, which do I need?

All-welded FRP resists the widest range of lab chemistry; 316L stainless suits high-temperature or solvent-heavy streams. The exhaust chemistry decides, and we confirm with the manufacturer.

How is redundancy handled in lab exhaust?

Critical containment runs N+1: parallel fans on a common manifold so one unit can be serviced while containment continues. Send us the application, airflow or demand figures, and any consultant specification. Our engineers reply with a defended selection, datasheets and submittal documentation. Sizing is always confirmed by an engineer, never by a web calculator.