By workplace & process
Active ingredients act at tiny doses, so the exposure limits are measured in micrograms and containment is layered. LEV is one part of that - and its test has to prove capture to a far tighter standard than general industry.
The short answer
Pharmaceutical production controls active ingredients that can affect the body at microgram levels, so the airborne targets are far lower than in general industry and the control is built up in layers - closed transfer, isolators, ventilated enclosures and local exhaust ventilation together. LEV is rarely the only control, but where it is used it has to be shown to capture and contain to that tiny margin, which is why the testing here is exacting.
The detail
Manufacturers rank active ingredients into occupational exposure bands, commonly OEB 1 to 5, according to how hazardous they are at low airborne concentrations. The higher the band, the lower the exposure target and the tighter the containment - highly potent ingredients such as many oncology and hormone compounds sit at the top, with targets often below one microgram per cubic metre. That number sets how the material may be handled.
Containment is then built as a cascade. Closed transfer systems and split-butterfly valves keep material enclosed; glovebox isolators, ventilated weighing enclosures and downflow booths contain the point where powder is exposed; local exhaust ventilation captures at open steps; and the facility itself uses pressure control, air changes and airlocks. Local exhaust ventilation sits inside that cascade, supporting containment for potent work and providing the primary capture for lower-band steps such as weighing and dispensing. Where an isolator or enclosure is used, its containment is verified by standardised performance testing, so the LEV that supports or surrounds it is judged against that same demanding benchmark rather than a general-industry rule of thumb.
What it means for you
A thorough examination and test of pharmaceutical LEV and ventilated enclosures confirms that capture and containment still perform against the exposure target the compound demands - not simply that air is moving. Because the targets are so low, drift that would be trivial in a workshop can be significant here, so the acceptance criteria and the scrutiny are correspondingly tighter, and the test runs at least every fourteen months alongside continuing user checks.
The airflow and containment evidence also matters beyond worker protection: it bears on cross-contamination between products, which is a good-manufacturing-practice concern. Proving that each enclosure and extract still holds - rather than assuming it does because it did on commissioning - is what keeps both people and product protected in a facility where the margins are this fine.
The service behind the guide
We test pharmaceutical LEV and ventilated enclosures against the microgram-level control your process demands, and report on capture, containment and the remedial work needed.
Questions
The acceptance criteria are far tighter. Active ingredients are controlled to microgram or even nanogram levels, so capture and containment have to be proven to a standard well beyond general industry, not just shown to move air.
An OEB is a potency category, usually OEB 1 to 5, that groups an active ingredient by how hazardous it is at low airborne levels. Higher bands mean lower exposure targets and stricter containment - isolators rather than open benches.
For the most potent compounds, no. LEV is one layer within a cascade - closed transfer, glovebox isolators, ventilated enclosures, pressure control - and often supports containment rather than being the sole control.
The statutory test is about worker exposure under COSHH, but the airflow and containment evidence it produces also bears on cross-contamination, which matters for good manufacturing practice. The two concerns overlap.
At least every fourteen months under COSHH Regulation 9, and often more frequently, with continuing user checks. Given the exposure targets, drift that would be trivial elsewhere can be significant here.
Phoenix Duct Clean · by the numbers
We test pharmaceutical LEV and ventilated enclosures against the microgram-level control your process demands, with a clear report and remedial actions.