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PVC Flue venting size


Trent Tarter

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The manufacturers' instructions usually contain very specific details about if, where, and how the intake and exhaust piping can increase or decrease dimension. Same with direct exhaust water heaters.

After looking at just a few different manuals, you'll see there's no rule of thumb. More often than not though, a diameter increase for the exhaust is not permitted outside of the furnace cabinet.

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