Configuration instructions: 1.Fan bearing capacity: ≤ 50 Kg, Mesh fan bearing capacity: ≤ 20 Kg. To maintain the best usage condition, it is recommended that the width-to-height ratio of the window be kept at approximately 1:1.5. 2.Suitable for window types with a window sash width of no more than 750mm. 3.Fan self-weight (total weight of glass, fan profiles and other accessories) x 1.4 (safety factor) ≤ hinge maximum load-bearing. 4.The reference manual for the use of hardware components is preceded by the Xifei maintenance and care statement.