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Elfich47 t1_j8g9mon wrote

Which section of the mechanical ventilation system? The only places I could even conceive of legionella growing is in cooling towers that are not properly maintained, and immediately downtream of cooling coils where the condensation pans are plugged and there is standing water.

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Onetap1 t1_j8hqn3v wrote

The cooling towers weren't 'properly maintained' by modern standards because the hazard wasn't recognized.

Cooling towers mostly vanished from AC systems in subsequent decades because the maintenance & chemical water treatment regimes are now so onerous and expensive. Air cooled condensers are more usual now.

Similarly, spray humidifiers were replaced with steam humidifiers, etc..

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