Put on my forerunner V6 4.0 and everything is fine. It has almost no back pressure, it's loud! But it runs so quietly that you hardly notice it's running, but if you press it down with your foot it gets very, very loud. That's great if you're looking for something very loud and tested.
Exhaust fan Soler & Palau SILENT-100 CZ, white 8 W
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