This unit replaces our old 20 year old C350C2 B fan unit fairly well. The tabs were a little thinner than the original but this one probably could more fan models to be replaced. Here is my theory about the noise level. Yes it is a little louder than the old block I would say but based on the amount of heap accumulated over the decades I would say the old one was isolated by this heap. We cleaned the fan outside and the grilles in between, but never went outside of that area to clean it, so there was a lot of lint inside. Now that we know about it, we'll definitely be cleaning indoors more often. I'm happy with the replaced fan and will accept the noise level based on our theory.
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