The drying temperature should be controlled at 52℃-55℃, the moisture content of mosquito-repellent incense is 40%. A piece of mosquito coils weighs 50 grams, and it becomes 30 grams after drying. A tray is 900 mm long and 450 mm wide. You can put 18 pieces of mosquito-repellent incense on one tray. The distance between two layers of trays is 40 mm. The size of a fixed drying rooms is 8 meters long, 4 meters wide and 2.2 meters high. More than 1,000 trays can be placed in one time, which means more than 1 ton of mosquito-repellent incense could be loaded at one time. After drying, they need to be dehydrated, and the weight will lose to 415 kg. The host dehydrates 75 kg water per hour, and the drying time for one batch is 6 hours.