CSST or Flex connectors thru cabinet

Posted by Noon-Air on June 11, 2008, 10:48 pm

> Vern Heiler wrote:

>> Petre, the problem is with the thickness of the flexible SST. Holes

>> burn thru easily. With thick schd. 40 black iron pipe, it just makes

>> a black mark on the exterior of the pipe.

>>> Vern Heiler wrote:

>>>> What is the definition of "unprotected knockout"? Does that mean if

>>>> there is a rubber grommet, its ok? Still would not stop lightning

>>>> arc.

>>>

>>> Doesn't make much difference. If you get hit by lightning , your

>>> screwed anyway. Do you really think even a foot of metal is going to

>>> stop a few hundred Billion volts of flash lightning? Have you ever

>>> noted the aftermath of a lightning strike. Yes Virginia yous can use

>>> flex to hook up a G.Furnace by the IMC. But do it right. The concern

>>> is sharp edge damage and kinking is a helluva a no no.

>>>

>>>>>> With the problem of lightning burning thru the thin wall of CSST,

>>>>>> and subsequent bonding requirements now enforced by code

>>>>>> officials, is running CSST or flexible gas connectors thru the

>>>>>> side of the furnace allowed by mfg's. installation inst?

>>>>>>

>>>>>> The practice is not a code violation in itself but mfg.

>>>>>> instructions trump code.

>>>>>

>>>>> It *is* against the manufacture's installation instructions and

>>>>> IMC to run a flex line through an unprotected knockout.

>>>>>

>>>>

>>> ** Posted from http://www.teranews.com **

>

> If the unit was a package unit, I could understand the "lightening" thing,

> but a furnace in a closet, attic, or basement? I also recommend using

> black pipe with a union for a solid connection, or flexible gas connector

> outside of the appliance. It's required under UMC. What's really

> intersting is the UMC also requires a drain leg, but no one does 'em

> anymore.

no drip leg?? wanna bet??

Posted by KJPRO on June 12, 2008, 1:57 am

> What's really intersting is the UMC also requires a drain leg, but no one

> does 'em anymore.

I's do.

Posted by Don Ocean on June 12, 2008, 7:43 am

Zyp wrote:

> Vern Heiler wrote:

>> Petre, the problem is with the thickness of the flexible SST. Holes

>> burn thru easily. With thick schd. 40 black iron pipe, it just makes

>> a black mark on the exterior of the pipe.

>>> Vern Heiler wrote:

>>>> What is the definition of "unprotected knockout"? Does that mean if

>>>> there is a rubber grommet, its ok? Still would not stop lightning

>>>> arc.

>>> Doesn't make much difference. If you get hit by lightning , your

>>> screwed anyway. Do you really think even a foot of metal is going to

>>> stop a few hundred Billion volts of flash lightning? Have you ever

>>> noted the aftermath of a lightning strike. Yes Virginia yous can use

>>> flex to hook up a G.Furnace by the IMC. But do it right. The concern

>>> is sharp edge damage and kinking is a helluva a no no.

>>>

>>>>>> With the problem of lightning burning thru the thin wall of CSST,

>>>>>> and subsequent bonding requirements now enforced by code

>>>>>> officials, is running CSST or flexible gas connectors thru the

>>>>>> side of the furnace allowed by mfg's. installation inst?

>>>>>>

>>>>>> The practice is not a code violation in itself but mfg.

>>>>>> instructions trump code.

>>>>> It *is* against the manufacture's installation instructions and

>>>>> IMC to run a flex line through an unprotected knockout.

>>>>>

>>>>

>>> ** Posted from http://www.teranews.com **

>

> If the unit was a package unit, I could understand the "lightening" thing,

> but a furnace in a closet, attic, or basement? I also recommend using black

> pipe with a union for a solid connection, or flexible gas connector outside

> of the appliance. It's required under UMC. What's really intersting is

> the UMC also requires a drain leg, but no one does 'em anymore.

Gotta have-em here in South Dakota, North Dakota, Minnesota, Iowa,
Nebraska, Wyoming and Montana. Its good for a dirt leg along with
condensation

>

Posted by -zero on June 12, 2008, 1:00 pm

>>>>> It *is* against the manufacture's installation instructions and

>>>>> IMC to run a flex line through an unprotected knockout.

>>>>>

>>>>

>>> ** Posted from http://www.teranews.com **

>

> If the unit was a package unit, I could understand the "lightening" thing,

> but a furnace in a closet, attic, or basement? I also recommend using

> black pipe with a union for a solid connection, or flexible gas connector

> outside of the appliance. It's required under UMC. What's really

> intersting is the UMC also requires a drain leg, but no one does 'em

> anymore.

... I do.

But what's wrong with a little 'T', nipple and a cap amongst
friends anyway? :o)

-zero

> Zyp

>

Posted by lp13-30 on June 11, 2008, 10:58 pm

Code here states that they must be hard piped 2" out of the unit, but as
long as the nut on the flex line is outside of the cabinet they haven't
turned us down yet. They have only been enforcing it for a few years--
maybe 3-4. Before that they would allow Armaflex on the line to protect
it. As I understand there was a fire/explosion due to a cut flex line,
so they had to start enforcing the code. We try to get the customers to
have it done for a fairly small charge during the annual maint.
service.I will usually do it free if we installed the furnace regardless
of it's age. I can personally attest to the potential danger. I had it
happen on one of my units at home-- on propane no less. Luckily I had
run out of propane when it happened. Larry