On Wed, 28 Dec 2011 05:50:46 -0800 (PST), "
wrote:
On Dec 27, 3:39Â*pm, wrote:
On Tue, 27 Dec 2011 12:22:44 -0800 (PST), "
wrote:
On Dec 27, 11:33Â*am, Davej wrote:
On Dec 26, 9:20Â*pm, Ed Pawlowski wrote:
I'd start herehttp://www.checkthishouse.com/49/water-heater-vent-pipe.html?utm_sour...
http://www.inspectapedia.com/chimney..._Flue_Size.htm
The 1992 GAMA vent sizing tables for single-wall metal vent connectors
attached to a tile lined masonry chimney uses Table 8. The result of
those calculation using a 38,000 BTU water heater with a 3" draft hood
and a 37,500 BTU boiler with a 4" draft hood connected to a 20' high
chimney is to use a common flue with an area of 28 square inches or a
6" flue vs a 5" flue in the previous examples.
These tables also indicate that a 3" vent is not capable of venting
the 38,000 BTU water heater. A 4" would be required. Also the flow
area of the chimney must not be more that 7 times the area of the
smallest vent area. Therefore, 7 x 7.065 = 49.455 vs 28, a 6 inch flue
pipe is ok. The maximum size flue that could be used is 8 inch at
50.3.
Wow, so they say the 5" size is fine. I just need to watch for
condensation and if I see any consider a 4" aluminum liner. Thanks.- Hide quoted text -
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Interesting question about the condensation. Â*I agree
you should be fine with a 5" flue as long as it's sound
and condensation should not be an issue. Â* But how are
you going to watch for it? Â*It would seem to me the
condensation would just run down inside the chimney
and you'd never see it. Â*Unless you sent an inspection
camera down the chimney on a cold winter day. Â*Or
had some inspection port you could access, etc.
That's one of the problems with condensation in a
chimney. Â*You don't know it's occuring and no easy way
to see the damage that it causes.
Â*Pop the cleanout open and look for a puddle?- Hide quoted text -
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What cleanout open? My chimney doesn't have any
cleanout opening.
Every chimney I've ever been associated with had one. Both chimneys
on the old house I grew up in, the chimney in my first house, the one
in my wife's first house, and the one in the house I now own. And
every house I've ever worked on for my friends.. Mabee it's a
"canadian thing". About 4X6 inch lift-off door at the bottom of the
flue - most often to the inside of the house - but I've seen them on
the outside of a chimey as well.