NYC Code for Venting a Navien 180?

nycjack

I was looking for information on venting clearances (windows, doors, decks, etc) but could only find references to building code 27 sub-chapter 15:

§[1504.8] 27-886 Special venting arrangements.
(a) Equipment with sealed combustion chambers. -
The vent requirements contained in this subchapter do
not apply to equipment having sealed combustion chambers
and which are so constructed and installed that all air
for combustion is derived from outside the space being
heated and all flue gases are discharged by integral vent
to the outdoors. Such equipment, having integral venting,
shall be installed in accordance with the conditions of
the applicable standard
governing their use.

What "applicable standard"?
Can anyone point me in the right direction?
Any information would be greatly appreciated.
Thank you.