What is the code for exterior duct in NYC

[tatail]

Hi everyone, first of all I would like to apologize if I am posting in the wrong forum as this is my first post.

I need some help regarding exterior natural gas duct.

So currently I have a residential property, a natural gas boiler and water heater both are vented through existing chimney.
What I would like to do is take out the vent through the wall and ran it outside the wall.

I would like to ask you guys if there is any code that would prevent me from doing such in NYC.
Also, what would be best option double wall or triple-wall duct?

thank you

 

[DAKSY]

Your best bet is to call the local building department. You don't have to give them your name or address, just tell them what you plan to do & ask for the particulars or ask for guidance. Every town, city or village adheres to regulations & some are more strict than others. That being said, many of the newer gas burning Direct Vent units do not require much more than a PVC line with an approved cap mounted on an exterior wall. Yours may be in that category. Bottom line is to do it right & if you do it your way & the Authority Having Jurisdiction (AHJ) - ie. Building Dept. disagrees with your methods, you may run into a situation where you have to tear EVERYTHING out. Nobody needs that grief. Do it once & do it right.

 

[Heatsource]

Bob's advice is great,

also, what does the manual/manufacturer of these appliances say regarding how it can be vented?
In my area if the manual says you can do it, then the building dept typically agrees.