Minimum Vent Pipe Clearance - Dunkirk XEB-2 Installation Instructions Manual

For boilers for connection to gas vents or chimneys, vent installations shell be in accordance
with Part 7, Venting of Equipment, of the National Fuel Gas Code, ANSI Z223.1-1atest issue
and applicable provisions of the local building codes.
CHECK YOUR CHIMNEY
This is a very important part of your heating system.
It must be clean, the right size, properly constructed
and in GOOD CONDITION. No boiler can function
properly with a bad chimney.
1. Use local codes for installation or National Fuel
Gas Code Z223.1-1atest issue. In Canada,
follow CSA 13149.1 or .2 Installation Codes. It
is very important to properly size the venting
system for induced draft appliances. Consult
the Vent Sizing Tables, in the National Fuel
Gas Code ANSI Z223.1-1atest revision for
correct sizing information In Canada, consult
the Vent Sizing Tables, Amendment #1 to CSA-
13149.1 and .2 Installation Codes.
2. The boiler's induced draft blower has a 3" outlet.
A 3"X 4" increaser fitting is included in the parts
bag. Locate the increaser fitting on the outlet
of the induced draft blower, and secure gastight
with a bead of the furnished silicone sealant.
The increaser fitting is required on this boiler
for Category I venting, and 4" is the minimum
permissible vent diameter. This does not imply
that the vent connector is intended to be 4"
diameter pipe. The vent connector shall be sized
according to the appropriate venting tables in
the National Fuel Gas Code or the Canadian
Installation Codes, and may be required to be
larger than 4" diameter.
The boiler installation for chimney venting
is not complete unless the 3" x 4" increaser
fitting is located and secured.
3. These are high efficiency boilers with a low stack
or exhaust temperature.
4. If venting into a masonry chimney without a liner,
line the chimney from top to bottom with either:
a. listed Type B vent pipe
b. listed flexible vent liner
c. poured ceramic liner.
5. Outside chimneys should not be used unless
they are either:
a. enclosed in a chase, or
b. lined with Type B vent pipe, or listed flexible
vent liner, or other certified chimney lining system.
6. The vent connector from the boiler to the
chimney should run as directly as possible with
as few elbows as possible.
7. Where possible, it is recommended to common
vent the water heater and boiler. Consult the
appropriate Vent Sizing Tables in either the
National Fuel Gas Code, or the Canadian
Installation Codes for specific requirements
of multiple appliance venting.
8. If the boiler is the only appliance connected to
the vent, Type B vent pipe is recommended
for the vent connector.
9. Slope pipe up from boiler to chimney not less
than 1/4" per foot.
10. End of vent pipe must be flush with the inside
face of the chimney flue. Use a sealed-in
thimble for the chimney connection.
11. The sections of vent pipe should be fastened
with sheet metal screws to make the piping
rigid. Use stovepipe wires to support the pipe
from above.
12. Do not connect to fireplace flue.
13. Do not install a damper on this boiler.
MINIMUM VENT PIPE CLEARANCE
If the vent pipe must go through a crawl space,
Type B vent pipe should be used. Where vent
pipe passes through a combustible wall or
partition, use a ventilated metal thimble. The
thimble should be 4 inches larger in diameter than
the vent pipe.