Easy to Install: One screw is loosened to remove the old unit, a new screw is supplied (same as the old screw), a new screw is screwed in and you're done finished. I had a small spatula on the edge of the case that I had to remove. With putty removal 10 min. Without her putty it would have been less than 5 minutes. The add has a bit of confusion, it mentions a plastic case. I have a plastic case for the fan, but the case of the whole unit is tin. High recommendations. I could buy a complete block for about $70, but then I'd have to rip out the old block (a lot of work). Attached is a photo of the serial number plate and the removed old device. Much luck
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