Hello, the main reason is that different industries have different requirements for the level of clean room, there are 10,000, 100,000 and other clean levels. So the different standards of course the price is not the same, then, the requirements for materials and equipment are also different, this aspect occupies a large part of the overall offer. For example: the cost of clean rooms in food factories are generally lower than laboratories, hospitals and other industries, which is very normal, thank you for adopting.