VA N TA G E
®
H E
I N S TA L L AT I O N M A N U A L
R O B E R T S
-
G O R D O N
pg 24
4" Single wall pipe
Vent adapter
Vent terminal
Vent adapter
4" Single wall pipe
Combustible or
non-combustible wall
Non-combustible wall only
18" minimum
Vent terminal
Figure 22. Horizontal Venting Configurations
HORIZONTAL VENTING (See Figure 21)
a) In combustible or noncombustible walls, use insulated
vent terminal (P/N 90502100, Tjernlund VH1-4 or
equivalent). Follow vent manufacturer’s instructions for
proper installation.
b) For noncombustible walls only, use vent terminal
(P/N 02537801).
c) 4" (10 cm) O.D. vent pipe is required, 30 ft. (9 m)
maximum length is recommended. Up to 45 ft.
(13.7 m) maximum may be used if insulated to prevent
excess condensation.
d) Vent terminal should be installed at a height sufficient
to prevent blockage by snow. Building materials should
be protected from degradation by vent gases.
e) Insure the vent pipe has a downward pitch of 1/2" per
20 ft. (1.3 cm per 6 m) away from the burner.
Requirements (United States)
a) Vent must exit building not less than 7 ft. (2 m) above
grade when located adjacent to public walkways.
b) Vent must terminate at least 3 ft. (1 m) above any
forced air inlet located within 10 ft. (3 m).
c) Vent must terminate at least 4 ft. (1.2 m) below, 4 ft.
(1.2 m) horizontally from, or 1 ft. (30 cm) above any
door, window, or gravity inlet into any building.
d) Vent terminal shall be located at least 1 ft. (30 cm)
from any opening through which vent gases could
enter a building.
Requirements (Canada)
a) Vent terminal must not be installed less than 3 ft. (1 m)
from any building opening.
b) Vent must be at least 6 ft. (1.8 m) from the combustion
air opening of this unit or any other appliance.
c) Vent terminal must be installed at least 3 ft. (1 m)
above grade.
UNVENTED OPERATION (INDOOR) (See Figure 20b.)
a) Sufficient ventilation must be provided in the amount
of 4 cfm per 1000 BTU/hr firing rate (United States); 3
cfm per 1000 BTU/hr firing rate (Canada).
b) If exhaust fans are used to supply ventilation air, an
interlock switch must be used to prevent the heater
from coming on when the fans are off. This may be
done using an air pressure switch.
c) For additional information: United States: Refer to
National Electrical Code, ANSI/NFPA-70 - latest
revision. Canada: Refer to CAN/CGA B149.1 and
B149.2: Installation Codes for Gas Bur ning
Appliances.