slot 18 b to retain the flange in the slot to mount the ceiling fan 10 to a ceiling the rod 14 fig1 is connected to the ceiling in any known manner and the housing 12 is connected to the rod with the lower portion of the rotor end casing 16 protruding slightly from the lower end of the housing 12 as shown in fig2 the blocks 18 are attached to the end casing 16 by the screws 19 and each blade 20 is attached to the arm 22 in the manner described above the flange 30 of each arm 22 is then inserted in its corresponding block 18 by positioning the flange radially inwardly from and aligned with the slot 18 b and moving the flange radially outwardly until the flange is secure in the slot in this position the balls 44 a and 44 b in the block are urged into the recesses 30 a and 30 b of the corresponding flange 30 in the manner describe above to lock the flange 30 in the slot 18 b in this manner rotation of the fan creates centrifugal forces that urge each flange 30 in a radial outwardly direction to further secure the flanges in their respective slots 18 b in the blocks 18 although only one blade 20 arm 22 and mounting block 18 are shown in fig2 and 3 it is understood that the other blades arms and mounting blocks are identical and are connected together and mounted to the end casing 16 in the same manner as a result of the foregoing the use of a large number of nuts bolts and screws is eliminated and the blades can be connected to the arms and the arms to.