Is an open pipe blowing cold air into the attic normal?
This usually means your HVAC ductwork is separating at different spots. Because many new homeowners lack experience with ductwork, they do not know what their options are to correct it. This leaves them worried about potential water damage, mold, or rot caused by the open air.
What the numbers show
Counted from the threads quoted below. How we count
- People have been saying this in most months since September 2026.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
Found another way around this?
Share your steps and trade-offs so fellow engineers don't have to reinvent the wheel. No account required.
Is an open pipe blowing cold air into the attic normal?
- 1putting a 3/4" pvc cap on it without gluing it shutDid this help you?
- 2Did a quick tape job until I finished the fan install.Did this help you?
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
“One was separating at 2 different spots.”source ↗
“What are my options to correct this? Is there anything else I need to check as far as water damage , mold , rot or anything that this may have caused.”source ↗
“I'm not that experienced with duct work or HVAC.”source ↗