Installation Guide

34 Rinnai Tankless Water Heater Installation and Operation Manual
I
Regulator vent outlet. In the event no regulator
is present, H and I can be disregarded.
The information below applies to Concentric and Twin Pipe:
V
Figure 13: Direct Vent Termination Clearances
Canadian Installations
1
(CSA B149.1)
U.S. Installations
2
(ANSI Z223.1/NFPA 54)
Ref Description Direct Vent (Indoor Unit) Direct Vent (Indoor Unit)
A Clearance above grade, veranda, porch, deck, or balcony 12 in. (30 cm) 12 in. (30 cm)
B Clearance to window or door that may be opened 36 in. (91 cm) 12 in. (30 cm)
C Clearance to permanently closed window * *
D
Vertical clearance to ventilated soffit, located above the
terminal within a horizontal distance of 2 ft (61 cm) from the
center line of the terminal
* *
E Clearance to unventilated soffit * *
F Clearance to outside corner * *
G Clearance to inside corner * 12 in.
H
Clearance to each side of center line extended above meter/
regulator assembly
3 ft. (91 cm) within a height of
15 ft. (4.6 m)
*
I Clearance to service regulator vent outlet 3 ft. 91 cm) *
J
Clearance to non-mechanical air supply inlet to building or
the combustion air inlet to any other appliance
36 in. (91 cm) 12 in. (30 cm)
K Clearance to a mechanical air supply inlet 6 ft (1.83 m)
3 ft (91 cm) above if within 10 ft
(3m) horizontally
L
Clearance above paved sidewalk or paved driveway located
on public property
7 ft (2.13 m) [1]
Vents for Category II and IV ap-
pliances cannot be located above
public walkways or other areas
where condensate or vapor can
cause a nuisance or hazard.
M Clearance under veranda, porch, deck, or balcony 12 in. (30 cm) [2] *
1
In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code.
2
In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code.
If locally adopted installation codes specify clearances different than those illustrated, then the most stringent clearance shall prevail.
Clearance to opposite wall is 24 in. (60 cm).
[1] A vent shall not terminate directly above a sidewalk or paved drive-
way that is located between two single family dwellings and serves both
dwellings.
[2] Permitted only if veranda, porch, deck, or balcony is fully
open on a minimum of two sides beneath the floor.
*Clearances are in accordance with local installation codes
and the requirements of the gas supplier. (Dégagement
conforme aux codes d’installation locaux et aux exigences
du foumisseur de gaz.)
SNOW
TERMINATION
Table 13. Clearances