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Discussion Starter · #1 ·
Its in my utility room with the furnace, gas water heater, washer/dryer, etc. It goes up into the ceiling and across my home and leads to an exterior vent on the opposite side of the house. Its has a constant flow of exterior air coming from it and I'm fairly certain its the cause of my chilly basement. I have a radon mitigation system in place so that probably helps to draw air through this pipe as well. I'd really like to close it off but a friend has mentioned it probably is to provide fresh air for furnace combustion however my furnace and home are only 11 years old and I thought one of the two PVC pipes off the furnace was for the fresh air.

 

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Discussion Starter · #5 ·
Well, that's not really what I want to hear. :wink:

Any suggestions to help with the amount of flow or temperature without sacrificing its purpose? It really does move at a good rate...
 

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It is for combustion.......though it should not have the 180 degrees of elbows on it.... Is your dryer gas?(combustion) Is your water heater gas (combustion)?

Thats a J hook, its to help prevent excess air from coming in when the furnace isn't running.

Of course if the clothes drier is running, then air will come in through it.
 

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A fresh air duct going from outside into the return duct and adding a supply in that room would help. The only reason that pipe in the picture has a lot of flow is because the home and/or the utility room are in a negative pressure. Eliminate the negative pressure and there will be almost no cold air dumping out of it.
 

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you can extend that pipe down and end it in a 5 gallon bucket (the kind you get at home depot) about 6 inches from the bottom of the bucket. this will make a cold air trap and the cold air will only come out when it is being drawn by and appliance
 

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you can extend that pipe down and end it in a 5 gallon bucket (the kind you get at home depot) about 6 inches from the bottom of the bucket. this will make a cold air trap and the cold air will only come out when it is being drawn by and appliance
Thats what the j hook is for. The Op has something causing a negative draft in that room. So the cold air would be coming out of the bucket too.
 
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