14 18-CD34D1-5-EN
INSTALLER’S GUIDE
Venting of fan assisted appliances into external chimneys (one
or more walls exposed to outdoor temperatures), requires the
chimney be lined with type “B”, double wall vent or suitable
flexible chimney liner material. This applies in all combinations
of common venting as well as for fan assisted appliances vented
alone.
The following installation practices are recommended to
minimize corrosion caused by condensation of flue products in
the furnace and flue gas system.
▲
WARNING
!
CARBON MONOXIDE POISONING HAZARD
Failure to follow the installation instructions for
the venting system being placed into operation
could result in carbon monoxide poisoning or
death.
1.
Avoid an excessive number of bends.
2.
Horizontal runs should pitch upward at least 1/4" per
foot.
3. Horizontal runs should be as short as possible.
4.
All vent pipe or connectors should be securely supported
and must be inserted into, but not beyond the inside wall
at the chimney vent.
5. When vent connections must pass through walls or
partitions of combustible material, a thimble must be
used and installed according to local codes.
6. Vent pipe through the roof should be extended to a height
determined by National Fuel Gas Code or local codes.
It should be capped properly to prevent rain water from
entering the vent. Roof exit should be waterproofed.
7.
Use type “B” double wall vent when vent pipe is routed
through cool spaces (below 60° F.).
8.
Where long periods of airflow are desired for comfort,
use long fan cycles instead of continuous airflow.
9.
Apply other good venting practices as stated in the venting
section of the National Fuel Gas Code ANSI Z223.1
“latest edition”.
10. Vent connectors serving appliance vented by natural draft
or non-positive pressure shall not be connected into any
portion of a mechanized draft system operating under
positive pressure.
11. Horizontal pipe runs must be supported by hangers,
straps or other suitable material in intervals at a minimum
of every 3 feet of pipe.
12.
A furnace shall not be connected to a chimney or flue
serving a separate appliance designed to burn solid fuel.
13.
The flow area of the largest section of vertical vent or
chimney shall not exceed 7 times the smallest listed
appliance categorized vent area, flue collar area, or draft
hood outlet area unless designed in accordance with
approved engineering methods.
Maximum Vent or Tile
Lined Chimney Flow Area
*Drafthood outlet diameter, flue collar diameter, or listed appliance categorized vent diameter.
π
(D*)
2
4
=
X 7
TABLE 8
GAS VENT TERMINATION
ROOF PITCH
MINIMUM HEIGHT
FLAT TO 7/12
OVER 7/12 TO 8/12
OVER 8/12 TO 9/12
OVER 9/12 TO 10/12
OVER 10/12 TO 11/12
OVER 11/12 TO 12/12
OVER 12/12 TO 14/12
OVER 14/12 TO 16/12
OVER 16/12 TO 18/12
OVER 18/12 TO 20/12
OVER 20/12 TO 22/12
1.0 FEET *
1.5 FEET
2.0 FEET
2.5 FEET
3.25 FEET
4.0 FEET
5.0 FEET
6.0 FEET
7.0 FEET
7.5 FEET
8.0 FEET
* THIS REQUIREMENT COVERS MOST INSTALLATIONS
Carbon monoxide, fire or smoke can cause serious bodily injury,
death, and/ or property damage.
A variety of potential sources of carbon monoxide can be found
in a building or dwelling such as gas-fired clothes dryers, gas
cooking stoves, water heaters, furnaces and fireplaces. The U.S.
Consumer Product Safety Commission recommends that users of
gas-burning appliances install carbon monoxide detectors as well
as fire and smoke
detectors per the manufacturer’s installation
instructions
to help alert dwelling occupants of the presence of
fire, smoke or unsafe levels of carbon monoxide. These devices
should be listed by Underwriters Laboratories, Inc.
Standards
for Single and Multiple Station Carbon Monoxide Alarms,
UL 2034
or CSA International Standard,
Residential Carbon
Monoxide Alarming Devices,
CSA 6.19.
NOTE: The manufacturer of your furnace does not test any
detectors and makes no representations regarding any brand
or type of detector.
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