Noritz ecoTOUGH NRC98-DV Installation Manual page 9

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.
Above grade, veranda, porch, deck,
A=
or balcony
Window or door that may be opened
B=
Permanently closed window
C=
Vertical clearance to ventilated soffit
located above the terminal within a
D=
horizontal distance of 2 feet from the
center of the terminal
E= Unventilated soffit
F= Outside corner
G= Inside corner
Each side of center line extended
H=
above meter/regulator assembly
Service regulator vent outlet
I=
Nonmechanical air supply inlet or
J= combustion air inlet to any other
appliance
Mechanical air supply inlet
K=
Above paved sidewalk or paved
L=
driveway located on public property
Under veranda, porch, deck, or
M=
balcony
[ ] = 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.
Clearance
4' (1.2m) below or to the side of
opening, or 1' (0.3m)above opening
3' (0.9m) within a height 15' (4.5m)
above meter/regulator assembly
opening, or 1' above opening
Vent Terminal
Air Supply Inlet
Indoor Combustion Air
12" [12" (300mm)]
[36" (900mm)]
*
*
*
*
*
3' (0.9m)
4' below or to the side of
[36" (900mm)]
3' above if within
10' [6' (1.8m)]
* [7' (2.1mm***)]
* [12" (300mm)****]
Area Where Terminal
is Not Permitted
Outdoor Combustion Air
(Direct Vent)
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" (300mm)****]
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