Clean Room Concept is the best solution for tackling indoor air pollution. Workplace/Room where particulate is kept within tightly controlled limits by forcing filtered air into the room.
Correct proportion of Fresh Air and Return Air pass through Pre Air Filter (Particle Filtration 10 or 20 micron) then air pass through Heater or Cooling coil where air either gain or lose temperature as per user’s process or personal requirement. Then Blower unit will increase velocity of air. Further air passes through Fine Air Filter (Particle Filtration 3 or 5 micron) then using Ductsystem filtered air enters into the Clean room through HEPA Filter (Particle Filtration 0.3 micron). This filtered air has greater internal air pressure than ambient pressure which helps to prevent intrusion of contaminants in the clean room. Generally used Air of clean room is re-circulate from wall venting near floor level exhausts (Riser Air Filter) and promotes laminar flow of incoming air. The advantage of laminar over turbulent airflow is that it provides a uniform environment and prevents air pockets where contaminants might congregate.
Clean rooms are designed to maintain positive pressure to ensure that filtered air always flows from cleanest to clean space. Controlling particulate is a process not an event thus sources (Particulate are generated continuously by people, processes, facilities and equipment.) must be eliminated whenever possible. In order to restrict or eliminate particulate into the room one must focus on air changes per hour (number of times each hour that filtered outside air replaces existing volume in a room), Air flow rate, Air flow direction, pressurization, temperature, humidity and level of filtration etc. Allowable level of particulate is dictated by specifications for operations being performed.