Noritz NRC98-OD Installation Manual page 7

Clearance Requirements from Vent Terminations to Building Openings
* All clearance requirements are in accordance with ANSI Z21.10.3 and the National Fuel Gas Code,
ANSI Z223.1 and in Canada, in accordance with NSCNGPIC.
Clearance
Above grade, veranda, porch, deck,or balcony
A=
Window or door that may be opened
B=
Permanently closed window
C=
Vertical clearance to ventilated soffit located above
the terminal within a horizontal distance of 2 feet
D=
(0.6mm) from the center of the terminal
Unventilated soffit
E=
Outside corner
F=
Inside corner
G=
Each side of center line extended above
H=
meter/regulator assembly
Service regulator vent outlet
I=
Nonmechanical air supply inlet or combustion air inlet
J= to any other appliance
K= Mechanical air supply inlet
Above paved sidewalk or paved driveway located on
L=
public property
Under veranda, porch, deck, or balcony
M=
[ ]= indicates clearances required in Canada
*Maintain clearances in accordance with local installation codes and the requirements of the gas supplier
***A vent shall not terminate directly above a sidewalk or paved driveway that is located between two
single family dwellings and serves both dwellings.
****Permitted only if veranda,porch,deck,or balcony is fully open on a minimum of two sides beneath the floor.
Vent Terminal
Area Where Terminal
is Not Permitted
Air Supply Inlet
Outdoor Installation
(See p.8)
12" [12" (300mm)]
12" [ 36" (900mm)]
*
*
*
*
*
3' (0.9m) within a height 15' (4.5m)
above meter/regulator assembly
3' (0.9m)
12" [ 36"(900mm)]
3' above if within 10' [6' (1.8m)]
* [7' (2.1mm***)]
* [12" (300m)****]
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