SECTION TWO – Heater Installation
wipe the cleaned surfaces dry with a clean cloth or
paper towel. Repeat for the exterior of the heater
end of the Appliance Adapter. Attach the appliance
adapter to the vent body using the adhesive speci-
fied by the vent manufacturer, following the vent
manufacturer’s instructions.
Risk of carbon monoxide poisoning if
Appliance Adapter is improperly attached.
Mechanical connections (such as screws) can
cause cracking and leaks in the Adapter or Vent
Body.
Do not drill holes or use screws to connect the
Appliance Adapter to the heater Vent Body. Attach with
the adhesive that is supplied with the Appliance
Adapter Kit.
Risk of fire or asphyxiation if vent is
not assembled according to manufacturer’s
instructions or if vent parts from different manu-
facturers are mixed.
Vent parts from different manu-
facturers ARE NOT interchangeable. Mixing parts from
more than one manufacturer may cause leaks or dam-
age to vent. When assembling a vent, pick one manu-
facturer and be sure that all vent parts come from that
manufacturer and are specified by the manufacturer for
your system. Follow manufacturer’s instructions and
local and National Fuel Gas Code requirements care-
fully during assembly and installation.
4. Install vent pipe so that it can expand and contract
freely as the temperature changes. Support the
vent pipe according to applicable codes and vent
manufacturer’s instructions. Pipe support must
allow the vent pipe free movement out and back,
from side to side, or up and down as necessary,
without putting a strain on the heater or Vent
Body. Slope horizontal pipe runs up from the
heater at least 1/4” per foot. Install Listed conden-
sate drains at low points where condensate might
collect. Plumb condensate drains to a drain
through hard piping or high-temperature tubing
such as silicone rubber or EPDM rubber – do not
use vinyl or other low temperature tubing. Follow
drain manufacturer’s installation instructions.
5. Use Listed firestops for floor and ceiling penetra-
tions. Use Listed thimble for wall penetrations. Use
a Listed roof flashing, roof jack, or roof thimble for
all roof penetrations. Do not fill the space around
the vent (that is, the clear air space in the thimble
or firestop) with insulation. The roof opening must
be located so that the vent is vertical.
6. Vent Termination – Vertical (See Table 2-F, Page
2-9, for height of vent termination above the roof
in the U.S. See Table 2-J, Page 2-12, for Listed ter-
minations.) Use a Listed vent terminal specified by
local and national codes and your manufacturer’s
instructions. Aroof termination must be vertical.
In Canada, the Vent Cap location must have a min-
imum clearance of 4 feet (1.2 M) horizontally from
electric meters, gas meters, regulators, and relief
openings.
7. United States Vent Termination – Horizontal (See
Table 2-J). Use a listed wall thimble and vent termi-
nal from Table 2-J.
In the U.S. the terminal must be located
(see Figure 2-10, Page 2-10):
• at least 3"and at most 12"out from the wall (see
Figure 2-10), following the vent manufacturer’s
instructions.
• at least 12"above finished grade or the normally
expected snow accumulation level, whichever is
higher.
2-11
Heater Venting – Positive Pressure
Brand
Manufacturer
Material Type
Sealant
Saf-T Vent
®
4”
Heat-Fab, Inc.
Metal
Consult Manufacturer
Special Gas Vent
38 Hayward Street
(Single Wall)
Greenfield, MA 01301
(800) 772-0739
Saf-T CI Vent
®
Heat-Fab, Inc.
Metal
Consult Manufacturer
Special Gas Vent
38 Hayward Street
(Double Wall)
Greenfield, MA 01301
(800) 772-0739
Z-Vent 4” Special
Z-Flex U.S., Inc.
Metal
G.E. RTV 106
Gas Vent (Type BH),
20 Commerce Park North
Model SVE
Bedrford, NH 03110-6911
(800) 654-5600
Table 2-G: Recommended Special Gas Vents (Positive Pressure)
