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Frost closure in vent stacks ?

4 years ago

Are there any good options for preventing frost closure of vent stacks? We've had problems both last winter and this winter in our new house. Never had this problem in 30 years at our previous house that's less than 5 miles away.

They appear to be 3". Would 4" or 5" be less likely to frost up? Other better options?

Thanks,

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