Installation
900960-00C, 06/2019
Innovative Hearth Products
DRT3500-C Series Direct-Vent Gas Fireplaces
14
Table 7 - Horizontal vent termination clearances for buildings with combustible and noncumbustible exteriors
U.S. Installation **
Canadian Installation *
A Clearance above grade, veranda, porch, desk, or balcony
12” (300 mm) **
12” (300 mm) *
B Clearance to window or door that may be opened
6” (150 mm)
for fireplaces < 10,000 Btu/h (3 kW),
9” (230 mm)
for fireplaces > 10,000 Btu/h (3 kW), and < 50,000 Btu/h (15
kW),
12” (300 mm)
for fireplaces > 50,000 Btu/h (15 kW) **
6” (150 mm)
for fireplaces < 10,000 Btu/h (3 kW),
12” (300 mm)
for fireplaces > 10,000 Btu/h (3 kW)
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
termination within a horizontal distance of 18” (458 mm)
18” (458 mm)
18” (458 mm)
E Clearance to unventilated soffit
12” (305 mm)
12” (305 mm)
F Clearance to outside corner
5” (127 mm)
minimum
5” (127 mm)
minimum
G Clearance to inside corner
6” (152 mm) minimum
6” (152 mm) minimum
H Clearance to each inside of center line extended above
meter / regulator assembly
36” (910 mm)
within a height of 15 ft above the meter / regulator assembly **
36” (910 mm)
within a height of 15 ft above the meter /
regulator assembly *
I Clearance to service regulator vent outlet
36” (910 mm)**
36” (910 mm)*
J Clearance to nonmechanical air supply inlet to building or
the combustion air inlet to any other fireplace
6” (150 mm)
for fireplaces < 10,000 Btu/h (3 kW),
9” (230 mm)
for fireplaces > 10,000 Btu/h (3 kW) and < 50,000 Btu/h (15 kW),
12” (300 mm)
for fireplaces > 50,000 Btu/h (15 kW)**
6” (150 mm)
for fireplaces < 10,000 Btu/h (3 kW),
12” (300 mm)
for fireplaces > 10,000 Btu/h (3 kW)
K Clearance to a mechanical air supply inlet
36” (910 mm) above if within 10 ft (3 m) horizontally **
72” (1830 mm) *
L Clearance above paved sidewalk or paved driveway located
on public property
84” (2130 mm) ‡
84” (2130 mm) ‡
M Clearance under veranda, porch, deck or balcony
12” (300 mm) *‡
12” (300 mm) *‡
N Depth of alcove (maximum)
72” (1830 mm) **
72” (1830 mm) *
O Clearance to termination (alcove)
6” (15.2 mm) **
6” (15.2 mm)*
P Width of alcove (minimum)
36” (910 mm) **
36” (910 mm) *
Q Clearance to combustible above (alcove)
18” (457 mm) **
18” (457 mm) *
*
**
‡
*‡
In accordance with the current CAN/CGA-B149.1 National Gas And Propane Installation Code
In accordance with the current ANSI Z223.1/NFPA 54 National Fuel Gas Codes
A vent shall not terminate directly above a sidewalk or paved driveway which 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 two sides beneath the floor
Fixed
Closed
Openable Fixed
Closed
V
V
V
V
V
V
X
X
V
X
G
G
J
F
B
B
K
H
I
A
E
L
D
B
M
C
B
V
V
A
G
G
B
TERMINATION CAP
AIR SUPPLY INLET
GAS METER
RESTRICTED AREA
(TERMINATION PROHIBITED)
Openable
See
Table 6
V
V
Inside Corner
V
V
Outside Corner
Recessed Location
Balcony with No Side Wall
V
Balcony with Perpendicular Side Wall
G
F
M
M
N
P
O
Q
