Profile: Gonka specializes in air-conditioning technology. We have air handling units, air cooled liquid chiller, vapor humidifier and water cooling tower. Our laminar flow extract systems reduces microorganism contaminants and particulate concentrations in air to the minimum level. We have plenum boxes, which are designed to operate with HEPA filters & are for suspended ceilings and they can be mounted to the ceiling with suspending-holes on them.