Installation and Maintenance Manual

Installation: Piping
GTND-SVX01B-EN 31
Figure 30. All unit sizes: Horizontal arrangement, single wall vent system to double wall termination
12” min.
(305 mm min.)
To prevent
building material
degradation from
flue gases.
Pitch flue pipe down toward
outlet 1/4” per foot
(21 mm/m) of run to allow
for condensate drainage
3 feet (0.91 m) plus maximum
snow depth for area above grade
3’-0” min.
(0.9 m min.)
6’-0” min.
(1.8 m min.)
Adjacent
building
Building
overhang
Approved
vent cap
(see instructions)
Flashing
Flue
dia.
Wall
8” to 10”
(203 to 254 mm)
maximum
Clearance to be as specified by
vent manufacturer
Seal joint between single wall vent and double wall vent
and the annular space of the double wall vent
Vent pipe diameter
Unit sizes 30–120: See Table 1, p. 12
Unit sizes 150–400: See Table 2, p. 14
Figure 31. All unit sizes: Vertical arrangement, single wall vent system to double wall termination
2 feet (0.609 m) plus
maximum snow depth for
area (vertical pip
extension over 12”
[305 mm] must be
insulated)
6’-0” min.
(1.8 m min.)
Adjacent building
Roof pitched
from 0° to 45°
Approved
vent cap
(see instructions)
Roof
Flashing
Flue
dia.
8” to 10”
(203 to 254 mm)
maximum
Clearance to be as specified by
vent manufacturer
Seal joint between single wall vent and “B”
vent and the annular space of the “B” vent.
Vent pipe diameter
Unit sizes 30–120: See Table 1, p. 12
Unit sizes 150–400: See Table 2, p. 14