Furnace Flue

[relliott]

Originally Posted by mlarson

Bob, you made the claim that back drafting was the issue.

I'm only asking you to explain why.

Am I to believe that heated flue gas will sucked into the discharging turbine and then the attic space or that the the discharge of the turbine will be sucked into the furnace vent by some means?

Again, I am mot claiming it is a good install only that a reason is lackin to hang one's hat on if challenged.

Personally I think it is in a gray area.

Yes it is a grey area and this is why they made the ruling.
The setup is not for certain going to cause a problem , but may cause a problem.

The turbin vent or any nearby object can create a negative pressure situation , and just because something is ok now , does not make it ok later.
Other wise ,why change your tires before they blow out.

Sorry I am not a air pressure theorist, yet knew not to stick my finger in a light socket as a kid, and that a paper bag will rise over a camp fire.

I could go back and forth looking up a hundred facts to back me up but you have not excepted any I have already provided, nor have you offered anything to back up your oppisite position.

If I except that the world is not flat , I can except this.

I have never circled the world and come back , so prove that it is not flat.
Guess I need to trust sometimes.

[Michael Larson]

Originally Posted by relliott

Yes it is a grey area and this is why they made the ruling.

I'm sorry. Did I miss your link to this "ruling" ?

[relliott]

Originally Posted by mlarson

I'm sorry. Did I miss your link to this "ruling" ?

Still no upload link here.

http://74.125.95.132/search?q=cache:...lnk&cd=5&gl=us

[Michael Larson]

Originally Posted by relliott

Still no upload link here.

http://74.125.95.132/search?q=cache:...lnk&cd=5&gl=us

I'm not finding any reference to this type of situation only clearance to combustibles.

[relliott]

Originally Posted by mlarson

I'm not finding any reference to this type of situation only clearance to combustibles.

Where is my baseball bat?

Ok here Mike. Top of page 3
As a general guideline, the CABO code requires a Type
B vent to terminate at least one foot above the roof and
not less than four feet away from any portion of the build-
ing which extends upward an an angle greater than 45
degrees from horizontal.
The requirements for Type L vents are similar, however
the minimum height requirement is two feet above the
As a general guideline, the CABO code requires a Type
B vent to terminate at least one foot above the roof and
not less than four feet away from any portion of the build-
ing which extends upward an an angle greater than 45
degrees from horizontal.

[Michael Larson]

We just don't see it the same way.


Perhaps others would care to offer their opinion on this.

[relliott]

Originally Posted by mlarson

We just don't see it the same way.


Perhaps others would care to offer their opinion on this.

I am suprised , since the votes must just be flipping a coin.

[David C. Macy]

What about on a calm day and the turbine is not moving.

There may be negative pressure or stack affect and possibly then back drafting could occur into the turbine from the chimney.

It would be better in my opinion if the chimney and turbine were further apart.

I would call it out as a potential safety concern and would advise extending the chimney another foot or so!

Just my 2 cents!!

[Michael Larson]

Originally Posted by dmacy

What about on a calm day and the turbine is not moving.

There may be negative pressure or stack affect and possibly then back drafting could occur into the turbine from the chimney.

It would be better in my opinion if the chimney and turbine were further apart.

I would call it out as a potential safety concern and would advise extending the chimney another foot or so!

Just my 2 cents!!

I agree it could have been done better but even a calm day you are asking me to believe the the attic would somehow be at negative pressure while the building is being heated from below.

I don't see how that happens but I'm certainly willing to listen to a reasonable explanation.

[Dennis R. Goudreau]

Ill try this,IRC 06,pg 41-G2427.6.8.2
vent offsets---type B or L( skipping the appliance sizeing) shall extend in a generally vertical direction with offsets not exceeeding 45 degrees, except that a vent system haveing more then a 60 degree offset shall be permitted. any angle greater then 45 degrees from the verticial is considered horizontal,the total horizontal distance of a vent plus the horizontal vent connector serving draft hooded appliances shall be not greater then 75 % of the verticial height of the vent

[ccurrins]

What I see is the flue vent installed correctly and the turbine vent installed in the wrong location.
Grandfathering.

[Michael Larson]

Originally Posted by dgoudreau

Ill try this,IRC 06,pg 41-G2427.6.8.2
vent offsets---type B or L( skipping the appliance sizeing) shall extend in a generally vertical direction with offsets not exceeeding 45 degrees, except that a vent system haveing more then a 60 degree offset shall be permitted. any angle greater then 45 degrees from the verticial is considered horizontal,the total horizontal distance of a vent plus the horizontal vent connector serving draft hooded appliances shall be not greater then 75 % of the verticial height of the vent

Hi Dennis,

What does offsets have to do with this?

[Dennis R. Goudreau]

Originally Posted by mlarson

Hi Dennis,

What does offsets have to do with this?

Mike, I was thinking height and overall clearance, wouldnt the clearance change with a offset

[Michael Larson]

Originally Posted by dgoudreau

Mike, I was thinking height and overall clearance, wouldnt the clearance change with a offset

The offset refers to deviations from vertical so I. not sure what you are referring to.

[Dennis R. Goudreau]

Originally Posted by mlarson

The offset refers to deviations from vertical so I. not sure what you are referring to.

this section deals with roof penetration, so would the exterior clearance from the turbine change