Furnace Flue

[bdoles2]

How many think it will ever get fixed, if it is such a concern?

I vote it will remain the same for the next 20+ years.

[relliott]

I have a good graphic but my upload link seems to be missing on here.
I only have the URL option.

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gas vent systems using vent caps listed by underwriter

’s

laboratories may terminate in accordance with this vent

termination table

roof pitch minimum height

feet meters
flat to 7/12 1 0.3
over 7/12 to 8/12 1.5 0.46
over 8/12 to 9/12 2 0.61
over 9/12 to 10/12 2.5 0.76
over 10/12 to 11/12 3.25 0.99
over 11/12 to 12/12 4 1.22
over 12/12 to 14/12 5 1.52
over 14/12 to 16/12 6 1.83
over 16/12 to 18/12 7 2.13
over 18/12 to 20/12 7.5 2.29

over 20/12 to 21/12 8 2.44

�������������������������������������������������� ��������������������������

gas vent systems using vent caps listed by underwriter

’s

laboratories may terminate in accordance with this vent

termination table

roof pitch minimum height

feet meters
flat to 7/12 1 0.3
over 7/12 to 8/12 1.5 0.46
over 8/12 to 9/12 2 0.61
over 9/12 to 10/12 2.5 0.76
over 10/12 to 11/12 3.25 0.99
over 11/12 to 12/12 4 1.22
over 12/12 to 14/12 5 1.52
over 14/12 to 16/12 6 1.83
over 16/12 to 18/12 7 2.13
over 18/12 to 20/12 7.5 2.29

over 20/12 to 21/12 8 2.44

[IMG]file:///C:/Documents%20and%20Settings/bob%20elliott/Application%20Data/M8%20Software/Spartan_Data/Clips/OL12.jpg[/IMG]

[Michael Larson]

Originally Posted by relliott

NO NO Mike

Bob, I did compliance to standards engineering for years. It's not as black and white as you imagine.

You are answering a question with a question.

Yes, to clarify the issue. So?

Your installation guides are all over the internet.
Argue with, them.

I stated from the beginning that the installation guide rules. You did read that right?

Find one that is different from what I referenced.

Irrelevant. Do you have all of them?

Why does a brick veneer wall need a one inch space rather than a 3/4 inch space? I do not know that either.

Because that's why.

Ever hear of the 3-2-10 rule.? Me too, but I just write it up.


Yes, but that is for the building structure. Ever hear of NFPA 54?

Gee ,am I being hard on this.

Yes, you are being a hard *****

Seriously I would imagine there is something called back drafting , which may come into play.

Explain your back drafting comment please.

[Michael Larson]

Originally Posted by bdoles2

How many think it will ever get fixed, if it is such a concern?

I vote it will remain the same for the next 20+ years.

Personally I couldn't find anything in my code books that state it has to be 2' above. It does say it has to be 2' above a wall/roof edge within an 8' range - that turbine does not look like a wall. I'd have to say this one would depend on the manufacturer suggestions.

You and me both.
It will be there 20 years from now unless someone replaces the flue or removes the ineffective turbine vent but that's another discussion.

[relliott]

Mike if it is close to the roof vent , the exhaust may backdraft into the living space.

But you already know this.Now who is giving the hard time.

Do you guys have a problem with uploading pics off your files right now ,as my graphic will explain.
The little paper clip thingy is missing.

[Michael Larson]

Originally Posted by relliott

Mike if it is close to the roof vent , the exhaust may backdraft into the living space.

But you already know this.Now who is giving the hard time.

Do you guys have a problem with uploading pics off your files right now ,as my graphic will explain.
The little paper clip thingy is missing.

How will it defy the laws of physics?

The clip thingy is missing on mine too.

[relliott]

Enough said

[Michael Larson]

Originally Posted by relliott

Trouble is NFPA doesn't use the term "anything".

12.6.2.1

A chimney for residential-type or low-heat appliances shall extend at least 3 ft. above the highest point where it passes through the roof of a building and at least 2 ft. higher than any potion of a building within a horizontal distance of 10 ft.

[relliott]

Originally Posted by mlarson

Trouble is NFPA doesn't use the term "anything".

This is not from NFPA and not a fire issue.

[Michael Larson]

Originally Posted by relliott

This is not from NFPA and not a fire issue.

Then explain the "issue" please.

And yes NFPA 54 is relevant for this installation.

[relliott]

Originally Posted by mlarson

Then explain the "issue" please.

And yes NFPA 54 is relevant for this installation.

This code originates from the CABO.

Ye sit is to prevent backdrafting, and no nothing is perfect, but those with more knowledge than you or I have determined this to be the optimum height requirement.

[Michael Larson]

Originally Posted by relliott

This code originates from the CABO.

Ye sit is to prevent backdrafting, and no nothing is perfect, but those with more knowledge than you or I have determined this to be the optimum height requirement.

You haven't explained how the turbine vent proximity will promote backdrafting.

Just seeking clarity Bob. Not picking on you.

[Michael Larson]

Originally Posted by relliott

This code originates from the CABO.

What is CABO?

Cabo Cabo San Lucas (BCS, Mexico)
CABO Council of American Building Officials ???
CABO Canadian Association of Basketball Officials
CABO Cisplatin, Methotrexate, Bleomycin, & Vincristine (chemotherapy regimen)
CABO Chemical Agents and Agents of Biological OriginCABOChemical And Biological Ordnance

[relliott]

Originally Posted by mlarson

What is CABO?

Cabo Cabo San Lucas (BCS, Mexico)
CABO Council of American Building Officials ???
CABO Canadian Association of Basketball Officials
CABO Cisplatin, Methotrexate, Bleomycin, & Vincristine (chemotherapy regimen)
CABO Chemical Agents and Agents of Biological OriginCABOChemical And Biological Ordnance

Must be the Basketball officials , since it has to do with drafting

Comon Mike, I guess you would argue that a flue vent can hit at a reverse angle , since it will just always rise naturally right?

[Michael Larson]

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.