Active sources

Have a defined gas flow emitted from source.  Example includes a biofilter or aerated pond.  According to VDI3880, an active source is defined by an average flow velocity of 30m/h…

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EN 13725 – YES/NO Mode

The assessor is asked to evaluate gas presented from a specific port and to indicate if an odour is perceived ( YES/NO). The assessor is aware that in some cases…

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Passive sources

Passive area sources usually and area have no defined flow or a weak flow.  Examples include a waste dump, clarifier or pond.  According to the VDI3880, a passive source has…

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