With regular ventilation devices in which air is extracted by ducts, such pockets of high CO concentration may well easily crop up as suction cannot be directional. Preferably a Jet Thrust Pollution Only Program can be created for the utmost ventilation charge, but would also incorporate Energetic controls (like pollution detection) https://car-park-ventilation45566.blog2freedom.com/36689355/detailed-notes-on-car-park-ventilation