The clean shed (simple dust-free room) is a simple clean room built for the fastest and most convenient. The clean shed has a variety of clean grades and space matching, and can be designed and manufactured according to the use requirements. Therefore, it is characterized by simple use, large elasticity, easy installation, short construction period and portability, At the same time, the clean shed can be added locally where high cleanliness is required in some areas of the general grade clean room to reduce the cost. Clean shed is an air purification equipment that can provide local high clean environment. The clean shed is mainly composed of box, fan, primary air filter, damping layer, lamps, etc., and the shell is sprayed with plastic. The product can be hung and supported on the ground, with compact structure and convenient use. It can be used alone or multiple connections to form a banded clean area.