1. Before the installation of air preheater, the installing procedure of tube box and supporting beam should be well arranged.
2. After the air preheater is located, cut the lifting parts and seal weld the lifting hole with steel plates. Make sure that the eddy current or smoke leakage would not happen. 
3. The spacing between the two side casings of air preheater and the tube box should be in strict accordance with the dimensions in the drawing. If it is too large, the local wear may be caused. The expansion joint welds of air preheater must be tight; otherwise, serious air leakage may be caused.
4. The tube box should be welded with the expansion joint, the connecting box and the mounts in strict accordance with the drawings, do not miss anyone. After the cold sealing test of boiler is done and tested qualified, the outer insulation construction of air preheater can be carried out.
5. The front and the back of primary air inlet, outlet are interchangeable, the left and the right of the secondary air inlet, outlet are also interchangeable. But when air fans are arranged by the design institute, the primary air fan and the secondary air fan could not be arranged on the same side, install them according to the arrangement of the design institute.