Several advantages, including materials, plastic with marks on the material used, and conformity to the criteria. Beautiful, and despite the fact that one of the two that were purchased is not properly centered, it can be seen that it drives the impeller, and there is vibration when the fan is turned on; however, because of the rubber mount of the rotor, this does not have a significant impact on the noise level or the beating that the fan itself produces. I recently installed it but haven't used it for quite some time. Have some cons; I bought two. mounting and rotor technology makes it possible to reduce negative vibrations, even in a housing that is "slightly" fixed. this means that the pounding of the fan impeller can be heard in one of the housings, but its impact is not significant.