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Originally Posted by aerohead
In the USA, all industrial / institutional / commercial buildings are designed to to provide around 10% outside 'makeup' air for all forced-air systems.
Rooftop units have an outside-air damper, which can be adjusted during air-balancing, which helps guard against 'sick building syndrome.'
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I'm not sure about the regulations here in Brazil, but temperature control seems to be treated as more important than a renewal of the air flow.
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For residential applications, MITSUBISHI offers a fine, air-to-air heat-exchanger, which thermally marries incoming outdoor fresh air, with out-going exhaust air, which works year round, to guarantee air-exchanges.
Electrostatic precipitators and HEPA filters are typically installed inline to provide top quality airflow.
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I don't see anything similar for residential applications in Brazil.
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If one lives in a region known for haboob, or dirt storms, like Phoenix, Arizona, or Lubbock, Texas, the outside inlet can be closed off, and the entire house brought to a higher static pressure than the wind force, to prevent unwanted infiltration of the particulates.
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Not sure about dirt storms being common anywhere in Brazil, even though in some regions an excessive amount of particulate matter coming from burnt bushes or burning sugarcane fields prior to the harvesting is a serious issue. What I don't understand is, as there are swamp-coolers and air conditioners meant to be used on agricultural machinery fitted with filters to clean the incoming air from the outside to the inside, the residential swamp-coolers that I often see and similar devices meant for commercial and institutional uses don't have this same feature.