Comment: the "V" in HVAC is Ventilation.

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the "V" in HVAC is Ventilation.

indoor air pollutants are only of 2 catagories. particulate and gaseous. only particles can be filtered out. even HEPA filters only catch particles, hence the name, High. Efficiency. particulate. Arrestance.
only specialized filters can remove gass's.
back when it was permitted, smokers actually improved indoor air quality.
today they just shut it off.
formaldehyde will kill you, but hey!
it smells good!