It has revealed fungal contamination of air handling unit (AHU) for the purpose of sanitary control. Fungal number of on the grass wool face of SA (supply air) chamber was larger than OA (original air). And Cladosporium sp. was the predominant fungi. Fungi on the grass wool were influence airborne fungi. If the water supply close to glass wool, that tends to grow fungi easily. This contamination feature helps sanitary provision.