4、吊頂風機過重時，應用4號角或5號角鐵做過梁，過梁應橫跨到另一塊頂板和墻板上，以減輕承重

Cold storage door refers to the door installed in the cold storage equipment, frozen storage room and other frozen environment equipment from the thermal insulation closed.
Installation technology of cold door
1, when choosing the location of the suspension point, first consider the best position of the air circulation, and second consider the structure direction of the library.
2, the gap between the cold fan and the reservoir board should be greater than the thickness of the cold fan.
3, the cold fan all hoisting bolts should be all secured, and sealant will bolt and hoisting bolt perforation closed, prevent the cold bridge and leakage.
4, when the ceiling fan is overweight, 4 horn or 5 horn iron should be used to make a beam, the beam should span to another top plate and wallboard to reduce the load bearing