With a 797 room, you will need to install or route air conditioning into the room in order to meet the requirements of the guideline. Generally in cleanrooms, if the outer room is already air-conditioned, this will usually provide enough cooling for a comfortable environment. Install diffusers six to eight inches below the HEPA filters for the best results. The need for air conditioning also depends on the number of people, equipment, and lighting in the room or enclosure, as all these factors will increase the temperature.