It looks very stylish, although this is the simplest model without any bells and whistles and design frills. In operation, it is almost silent, you can hear how the blades rustle, the air flow runs, the sound of the engine is practically absent! I installed it once, the mounting holes for mounting to the wall, apparently, were made according to the standard, so I installed it on the holes from the old Polish "Dospel" - I sat down like a native. The design is very well thought out, the interior is sealed. The valve is true - a thin transparent film, like a diaphragm, but it’s quite realistic, if necessary, to replace it - from improvised materials - I cut it out and installed it, I don’t foresee any problems. Work - we'll see. So far I'm 100% satisfied.