air filters

passivhaus passive house dirty pollen air filters after 4 months in London

After less than four months these pollen filters, from one of our heat recovery ventilation units, have trapped so much London air pollution that they need changing for fresh filters. By comparison, in a German city, where urban air quality is very much better, the same filters need changing only once a year. German vehicle testing (with the introduction of a colour-coded 'flag' system) would prevent a large proportion of UK vehicles from entering a German city.

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