Code inspector hating on my oven vent

[Du Manchu]

We got a visit from the city mechanical code inspector this week.  He is insisting that we re-do our exhaust vent pipe with double wall schedule B piping.   Anyone (or everyone) running double wall?

It's just going to be Disruptive and expensive to redo.  I might could plea my case with some facts, as the inspector was actually debating himself about letting it go, but at the last minute googled a Hix owners manual and found a "recommendation for double wall". 

The current single wall pipe cannot be reached from the floor., so not  employee burn issue. It's a metal roof.  I just don't see the need.

Anyone have any arguments for or against?

Thanks.

[T Shirt Farmer]

Your duct guy should have known better .... never enough time to do it right the fist time but always enough time to do it over.

[californiadreamin]

We got a visit from the city mechanical code inspector this week.  He is insisting that we re-do our exhaust vent pipe with double wall schedule B piping.   Anyone (or everyone) running double wall?

It's just going to be Disruptive and expensive to redo.  I might could plea my case with some facts, as the inspector was actually debating himself about letting it go, but at the last minute googled a Hix owners manual and found a "recommendation for double wall". 

The current single wall pipe cannot be reached from the floor., so not  employee burn issue. It's a metal roof.  I just don't see the need.

Anyone have any arguments for or against?

WARNING !!! Be polite to Code Inspectors
Based on your description on non combustible roof/surrounding areas You Should Have No Problems
According to NFPA 86 5.4.3 , (Ovens and Furnaces)  NFPA91 (Standards For Exhaust)
NFPA is NORMALY the law of the land! If not then ask what Laws Over Rule NFPA
Based on the pics, what little I can see you need to seal off around the Insulation with Metal Faced HVAC Tape or Mastic
Also Seal off the duct taped door with the same.
If your Stack exceeds 160 Degrees Wrap with Insulation
That should Do It.
Good Luck
Winston
904.3430848

Thanks.

[TCT]

I second not messing with an inspector, they can and will make you day/week/month hell.
Don't know if I've ever seen(not that in any expert) a double wall pipe on a electric dryer. Gas yes, but seems extreme for electric.

[californiadreamin]

I second not messing with an inspector, they can and will make you day/week/month hell.
Don't know if I've ever seen(not that in any expert) a double wall pipe on a electric dryer. Gas yes, but seems extreme for electric.

TCT, my same thoughts.
A type "b" Double Wall Exhaust Is Usually Required On Gas Burners of 125,000 BTU's and up.
The reason is, up to 20% of ALL (natural/LP) Gas Does Burn when it mixes coming thru the burner, which is
also why an Exhaust system Removes 21% of all heated air(NFPA LAW).  The type" B" is a redundant tube that is to
protect the un burnt gas from excapeing into your shop and igniting (Boom!) You can not also have a screw  penetrating the type " b" flu,
which is why they twist and lock together, and all duct hangers are to be mounted on the outside with out screws. Since a electric does
not have residual gas, the Law does not apply. Hope this helps.
TCT! Every time I see a Sroque I think of being in your shop. You took a chance on them when most would not!
Now look at them. They are popping up every where. I just stuck a new dryer behind one in Long Beach. You should be getting a commission!
winston

[TCT]

We are getting our 2nd one next week. I'm super excited to say the least!

[californiadreamin]

We are getting our 2nd one next week. I'm super excited to say the least!

I Bet You Are! They Appear to Already Have, Or Are Rapidly Becoming The Machines To Beat. Superb Enginering.

[Sbrem]

Do what he says to do and move on, don't screw with those guys, you want them on you side, and a really good way to do that is to follow their advice; tell them it's much easier to do it right and not have those issues, and thank him, now you know.

Steve