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Chellapillai- there is no need to do any indoor air circulation for this credit- this credit relies on the quantity of outside air brought through the building. While filtration is a good thing and may be required if you are also pursuing IEQ credit 3.1 and/or IEQ credit 5, this credit does not require any filtration for the outside air you are bringing in- you could essentially use a large fan to bring the air in for this credit if you can meet the temperature and humidity requirements.