Fresh air for plant cultivation in closed rooms under artificial light must be well distributed all over the room.
In case the air is too warm or even "insipid", the plant can not flower out and the crop will be derogated. Ventilators can avoid this!
Only with ventilators you can aim a sufficient circulation of the air, that has an effect on the entire room. This can be done by posing one of our ventilators in the middle of the room and make it blow against the ceiling.
In case your using an additional humidifier, pose it directly next to the ventilators.