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My neighbor's house sits 20ft from mine. Their furnace exhausts out the side of their house about 3 ft above the ground. The exhaust is blowing onto the side of my house and into the attic vent. Their furnace is a newly installed unit. Is this dangerous or can it damage my house?

  • Your attic vent is near this exhaust even though the exhaust is 3ft above ground? Could you post some pictures? I think that would help us visualize what the situation is. Thanks! – PhilippNagel Dec 23 '19 at 16:04
  • As the exhaust floats up, it is drifting towards the attic vent. Today is a cold day, so it is very noticeable. – user110388 Dec 23 '19 at 16:05
  • I have read that this exhaust can be acidic. Can it damage the house siding? – user110388 Dec 23 '19 at 16:09
  • Please add new information and questions to the post, not in comments. – isherwood Dec 23 '19 at 16:31
  • 20 feet away? How do you know it's your neighbors exhaust? 20 feet will dilute any exhaust. – Gunner Dec 23 '19 at 16:32
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The water vapor is slightly acidic but not enough to damage plant life in my experience. At 20’ horizontal and then 7-8’ up the carbon monoxide should be well diluted but this is probably what you notice, almost all of the systems I have installed exhaust to the roof the one that was in a wall was at 9’ , but that may be a requirement for my area as it was specified on the prints.

The one thing I would question is if the moisture stream is actually hitting your house? if it is ask them to install a 45 or 90 to direct the moisture to the ground as horizontal moisture acidic or not could cause issues.

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