Vent Terminal Installations
Important:
The vent system must terminate so that proper
clearances are maintained as cited in local codes or the lat-
est edition of
“Natural Gas and Propane Installation
Code” CAN/CSA-B149.1
(Canada), or
“National Fuel Gas
Code” ANSI Z223.1 (NFPA 54)
(U.S.A.).
The following requirements are illustrated in Figure 6:
1. (“A”) Minimum 2.1m (7 ft.) above a paved sidewalk or
paved driveway that is located on public property.
2. (“B”) Minimum 900mm (3 ft.) above any forced air or
mechanical air supply inlet located within 1.8m (6 ft.)
horizontally (Canada) or 3m (10 ft.) (U.S.A.).
3. (“C”) Not within 900mm (3 ft.) from any gas service reg-
ulator vent outlet.
4. ("D") Minimum 900 mm (3ft) horizontally of the vertical
centerline above the regulator vent outlet to a maximum
vertical distance of 4.5m (15ft).
5. (“E”) Minimum 305mm (1 ft.) above grade level or antic-
ipated snow level.
6. (“F”) Not within 305mm (1 ft.) of any window or door that
can be opened, of any non-mechanical air supply inlet
or of the combustion air inlet of any other appliance.
7. (“G”) Minimum 305mm (1 ft.) distance between the top
of the vent termination and the underside of a veranda,
porch or deck.
8. The manufacturer recommends the vent termination
shall not be mounted directly above or within 900mm (3
ft.) horizontally from an oil tank or gas meter to avoid
potential freeze-up from condensation.
9. (“J”) The manufacturer recommends the vent terminal
not to be installed closer than 900mm (3 ft.) from an
inside corner or 610mm (2 ft.) from outside corner on an
“L” shaped structure.
Plan the vent system layout so that proper clearances are
maintained from plumbing and wiring. Vent pipes serving
power vented appliances are classified by building codes as
“vent connectors”. Required clearances from combustible
materials must be provided in accordance with information
in this manual under “Location Of Heater” and with the lat-
est edition of
“Natural Gas and Propane Installation
Code” CAN/CSA-B149.1
(Canada), or
“National Fuel Gas
Code” ANSI Z223.1 (NFPA 54)
(U.S.A.) and local codes.
– 11 –
A
E
F
F
Figure 6
Vent Terminal Installations
J
G
GAS METER AND
REGULATOR
MECHANICAL AIR
SUPPLY INLET
1.8m (6 ft.) (Canada),
3m (10 ft.) (U.S.A.)
D
CL
C
F
F
F
B
