CIRCULATING THE QI

I have a habit of leaving the library door open early in the morning and switching on all the fans to circulate the Qi, especially if the place has not been used over the weekend.  If the place has been left unused for a stretch of time, I'd open all the windows as well.
In Feng Shui, it is not good to have stagnant Qi in a place as it brings about dullness, illness and negativity.