12
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
General Information
900355-00, 06/2016
Innovative Hearth Products
Montebello
®
ST Direct-Vent Gas Fireplaces
Figure 6 - Horizontal vent termination clearances for buildings with combustible and noncumbustible exteriors
X
V
V
V
V
V
X
V
= Vent terminal
= Air supply inlet
= Area terminal NOT permitted
= 9" U.S. (12" Canada)
C
A
L
B
C
B
B
C
C
B
B
A
G
J
H
I
K
M
D
E
V
V
X
V
F
Fixed Closed
Window
Operable
Window
D
36"
(91.4 cm)
MINIMUM CLEARANCES
Clearance Description
US Installation
Canadian Installation
A = Clearance above grade, veranda, porch,
deck, or balcony.
18" (46 cm)
18" (46 cm)
B = Clearance to window or door that may be
opened.
6" (15.2 cm) for appliances < 10,000 BTU/hr (3kW),
9" (23 cm) for appliances > 10,000 BTU/hr (3kW) and <
50,000 BTU/hr (15kW),
12" (30 cm) for appliances > 50,000 BTU/hr (15kW).
6" (15.2 cm) for appliances < 10,000 BTU/hr (3kW),
12" (30 cm) for appliances > 10,000 BTU/hr (3kW) and <
100,000 BTU/hr (30kW),
36" (91 cm) for appliances > 100,000 BTU/hr (30kW).
C = Clearance to permanently closed window. 9" (229 mm) recommended to prevent window
condensation.
12" (305 mm) recommended to prevent window
condensation.
D = Vertical clearance to ventilated soffit
located above the terminal within a
horizontal distance of 36" (91.4 cm)
from center line of terminal.
24" (61 cm)
24" (61 cm)
E = Clearance to unventilated soffit.
24" (61 cm)
24" (61 cm)
F = Clearance to outside corner.
5" (12.7 cm)
5" (12.7 cm)
G = Clearance to inside corner.
24" (61 cm)
36" (91.4 cm)
H = Clearance to each inside of center line
extended above meter/regulator assembly.
3 ft (91.4 cm) within a height of 15 ft above the
meter/regulator assembly.
3 ft (91.4 cm) within a height of 15 ft above the
meter/regulator assembly.
I
= Clearance to service regulator vent outlet. 3 ft (91.4 cm)
3 ft (91.4 cm)
J = Clearance to non-mechanical air supply
inlet to building or combustion air inlet to
any other appliance.
6" (15.2 cm) for appliances < 10,000 BTU/hr (3kW);
9" (23 cm) for appliances > 10,000 BTU/hr (3kW)
and < 50,000 BTU/hr (15kW);
12" (30 cm) for appliances > 50,000 BTU/hr (15kW).
6" (15.2 cm) for appliances < 10,000 BTU/hr (3kW);
12" (30 cm) for appliances > 10,000 BTU/hr (3kW)
and < 100,000 BTU/hr (30kW);
36" (91.4 cm) for appliances > 100,000 BTU/hr (30kW).
K = Clearance to mechanical air supply inlet.
3 ft (91.4 cm) above, if within 10 ft (3 m) horizontally.
6 ft (1.83 m)
L = Clearance above paved sidewalk or paved
driveway located on public property.
7 ft (2.13 m)
7 ft (2.13 m)
M = Clearance under veranda, porch, deck, or
balcony.
18" (46.0 cm)
18" (46.0 cm)
In accordance with the current ANSI Z223.1 / NFPA 54 National Fuel Codes (latest editions).
In accordance with the current CAN/CGA-B149.1 Installation Code (latest editions).
A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single-family dwellings and serves both dwellings.
Only permitted if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
NOTE:
•
Local codes or regulations may require
different clearances.
•
Location of vent termination must NOT
interfere with access to electrical service.
X
V
V
V
V
V
X
V
= Vent terminal
= Air supply inlet
= Area terminal NOT permitted
= 9" U.S. (12" Canada)
C
A
L
B
C
B
B
C
C
B
B
A
G
J
H
I
K
M
D
E
V
V
X
V
F
Fixed Closed
Window
Operable
Window
D
36"
(91.4 cm)
X
V
V
V
V
V
X
V
= Vent terminal
= Air supply inlet
= Area terminal NOT permitted
= 9" U.S. (12" Canada)
C
A
L
B
C
B
B
C
C
B
B
A
G
J
H
I
K
M
D
E
V
V
X
V
F
Fixed Closed
Window
Operable
Window
D
36"
(91.4 cm)
[DETAIL]
Inside Corner
Center Line of
Horizontal
Termination
Inside Corner
Ventilated
Soffit
Exterior Wall
[DETAIL]
See Item “D” in table below.
