8x8 clay liner question


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Old 01-04-14, 04:42 PM
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8x8 clay liner question

Hello-

What is the inner flue dimensions to a standard 8x8 clay liner?

(I assume its not 64")

And how does that pertain to something called the '7x rule'? and if a water heater heater can be vented into it.....
 
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Old 01-05-14, 04:05 AM
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Is anything else using this chimney? You aren't allowed to use one flue for multiple vents.
I'm not sure I understand the rest of the question Unless I'm mistaken the clay flue liner in my chimney is 7" square. I'm not sure if that's a nominal size or actual exterior or interior dimension.
 
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Old 01-05-14, 04:21 AM
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An 8x8 clay liner would have a smaller inner flue dimension. Probably 7x7 or even 6.5x6.5... im not sure which.

Theres a rule of thumb called the 7x rule and I am not sure how the inner dimension of that liner would calculate with a water heater.

As far as multiple vents using the same chimney, although this is not the case in my situation, I would say the majority of 80 percent or less furnaces share a chimney with a water heater so I am not sure what you mean about not being able to use multiple vents with one chimney/flue.

Regardless, my original questions remain.... thank you.
 
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Old 01-05-14, 04:25 AM
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Locally the list them as 7x7 liners as they typically fit in either chimney block that has an 8x8 void in the middle or other block/brick laid to the same dimensions.

I probably didn't explain well You can have multiple flues in one chimney but you can only exhaust one device per flue.
 
 

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