Humidification Systems are used to remove particulates. These systems require either a separate filtration chamber to remove the particulates from a recirculating water phase or a continuous purge of wastewater to maintain the concentration of suspended solids at a reasonable level. Typical problems of humidification systems are clogged packing and water carry-over to the filter bed. Humidification systems are used to maintain the comfort and health of occupants to prevent cracking of wood and to preserve materials. There are three types of humidification systems, they are evaporative pan, steam injection and water spray. Humidification systems produces warm humid air of controlled relative humidity. Humidification systems provide a mist of the correct particle size in order to deliver a therapeutic aerosol.