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Old 05-23-2013, 07:33 PM   #1
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hot water heater venting


Is 4" the new code for water heater natural draft size? Also, is it ok to use foil tape on the vent pipe for a water heater?

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Old 05-23-2013, 08:55 PM   #2
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4 inch not manditory here yet...... foil tape is fine to use....

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Old 05-23-2013, 10:46 PM   #3
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Depending on the plumbing code on the state you are.
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Old 05-24-2013, 12:17 PM   #4
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And sometimes it falls into the municipal jurisdiction of the area providing the permit (like Vancouver BC).
4 inch is asked for here and foil tape is fine.
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Old 05-24-2013, 03:19 PM   #5
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Make sure the pipe is installed in the direction of flow crimped end inside the non crimped end to wards the chimney. I like to install drill screws 2 in each joint.
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Old 05-24-2013, 03:51 PM   #6
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Typically it's dictated by the size of the flue on the heater. There would never by a reduction in size allowed.

Your going to have a choice of two types of pipe. Single wall or B-Vent (double walled). With single wall you have to stay 6" from any combustionable material. B-vent, 1".

On single wall, you are typically required to have 3 screws per joint. B-vent....they interlock so most inspectors don't require screws.

Both types require tape...metal tape....do NOT use duct tape. And you should also tape the seams on elbows...

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