Many residential buildings have horrible ventilation as they commonly rely on the random forces of wind and thermal gradient to force fresh air through cracks a

Many residential buildings have horrible ventilation as they commonly rely on the random forces of wind and thermal gradient to force fresh air through cracks around windows and doors and through other holes in the building envelope. This can lead to long periods of time with ventilation far below ASHRAE standards. Conversely, if you are getting enough ventilation through leakage, the quality of the air may be poor due to pollen or other pollutants. One way to address this is to set up a positive pressure situation with a high quality air purifier pulling fresh outside air through a ducting system like https://www.iqair.com/sites/default/files/documents/InFlowW125InstallationInstructions_105_20_20_11_Mar2012.pdf https://www.iqair.com/sites/default/files/documents/InFlowW1.... If you don't own your home or just don't want to run a duct through your wall, you can add a window kit such as the LG COV31735301 Room Air Conditioner Exhaust Duct.