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Posted by on January 15, 2007, 10:08 pm
wrote:
>On Tue, 16 Jan 2007 01:20:36 GMT, gofish@gonefishin.net wrote:
>
>> searay45@excite.com wrote:
>>
>>>I just had a new furnace installed, it is a direct vent so all I have
>>>is my 40k btu 50 gal gas hot water heater to vent. I was wondering if
>>>I could use 4" B-vent out of my heater and up threw my roof. It would
>>>be about 12' total. Or do I have to go bigger than 4" .
>>
>>4" is perfectly fine for your application. make sure you use a 4"
>>b-vent roof jack and storm collar and b-vent top. i believe the code
>>specifies 2' above anything within 10' of the vent termination.
>
>C'mon fish. Where'd you come up with that "4" is perfectly fine"
>mumbo-jumbo?
>Fact is you are just guessing. You need to consult the gamma tables
>to get it right.
>4 inch may be too big and allow unneeded condensation and improper
>draw on the vent.
>You'll notice that using the Gamma tables located here:
>http://icpindexing.mqgroup.com/documents/076416/gama%20vent%20tab.pdf
>Your "4 inch" guess is able to handle anywhere from 70,000 to 112,000
>btu depending on theactual lateral and vertical length of pipe which
>the OP didnt give. The 3 inch will handle 36,000 to 58,000 btu again
>depending on the actual vertical and lateral lengths.
>Stop using those "Thumbs" and get the facts.
>Bubba :-)
the facts are Bubba, his install sounds exactly like how mine is
installed only my vertical is closer to 5'. off the wawa heater is a
3", to which I installed a couple single wall 3" -45's into a 3x4 plug
reducer then 4" b-vent. but yeah, :-)
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