No-Pest Vent, 4 Inch Soffit Vent Cover, Great for Bathroom or Dryer Vents, Patented Dual Door Design Prevents Birds and Back Drafts, Highest Efficiency Soffit Exhaust Vents on the Market (Onyx Black)

No-Pest Vent, 4 Inch Soffit Vent Cover, Great for Bathroom or Dryer Vents, Patented Dual Door Design Prevents Birds and Back Drafts, Highest Efficiency Soffit Exhaust Vents on the Market (Onyx Black)

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Signal-Carry4944 posted on r/sauna3w

Not claiming it's the best way because it sure looks janky, but I found that mounting the fan directly to the back wall really amplified the vibration from the fan. To quiet it down I made a little stand out of pressure treated 2x4 and set it away from the sauna structure an inch or so, and connected ducting to a surface flange ( https://www.amazon.com/dp/B0DYYSKDCS "Duct Connector Flange 4 inch") that I screwed to the wall over the 4" hole. I mounted the fan with flow facing down, and put a soffit vent cover on the outlet to keep pests out: https://www.amazon.com/dp/B0FQW86D18 "4 Inch Soffit Vent Cover, Great for Bathroom or Dryer Vents"