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Measured assessment · Office
CETEC assessment of the HA800 air purifier in office settings
CETEC is an indoor environmental testing specialist offering WELL performance-verification services.
In CETEC’s six-hour closed-office manual-mode assessment at London South Bank University, average PM2.5 and PM10 concentrations were 77.5% and 86.4% lower at hour 4, when the HA800 was operating, than at hour 2, when it was off.
The hour-2 PM2.5 average was already low at 1.51 µg/m³. Separately, CETEC reported a 59.1% reduction in meeting-room total volatile organic compounds (TVOC).
Closed office · manual mode · hourly averages at assessment hours 2 and 4
1.51 → 0.34 µg/m³
22.90 → 3.12 µg/m³
The HA800 operated for the middle two hours of the six-hour particle assessment. The available reports do not identify the specific sampling periods or analytical method for the separate meeting-room TVOC figures.
Sources: CETEC, Q23020231 manual (3 Mar 2023) and auto (21 Jul 2023) assessment reports; Amrouche et al., UKIEG poster (7 Sep 2023). Reports held by Healthy Air Technology.
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