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Boilers and furnaces equipped with listed
Listed gas appliances with draft hoods
Other Cat I appliances able to use B-vent
Note: When using a listed connector, the clearances specified on that connector may
be used, unless a different clearance is specified by the Appliance manufacturer.
The masonry chimney will also need to satisfy the NFPA 211 requirements for
clearances to the top of the chimney.
For solid-fuel venting, you will need to
be at least 3-feet above the penetration
through the roof, and at least 2-feet
higher than anything within 10-feet
around the chimney. For gas, oil, or
pellet venting, you need to be at least
2-feet above the penetration through
the roof, and also 2-feet higher than
anything within 10-feet around the
chimney (Figure 1).
The DuraFlex SS Chimney Liner System consists of a continuous Flexible Liner from
the top of the chimney to the appliance connection. (Figure 2) This system is
relatively easy to install, even in masonry chimneys that are constructed with an
offset. This single-wall DuraFlex SS Liner system is intended for installation in
masonry chimneys which comply with NFPA 211 requirements and local codes.
If you are installing a gas burning Category I or draft hood equipped appliance in cold
climates,you may want to switch to double-wall, (air) insulated Type B gas vent near
the top exposed portion of the chimney. (Figure 3) At the top of the chimney, the
flue gas has lost much of its heat, and becomes susceptible to corrosive condensation
and poor draft. This is very true with fan-assisted (Category I) gas appliances.
Fuel
Minimum Clearance Minimum Clearance from
Burned
from Liner to Masonry Masonry to Combustibles
Gas/LP
Pellet, Oil
Wood, Coal
Wood, Coal
NorthlineExpress.com
gas burners and with draft hoods
CHIMNEY LINER SELECTION
Table 1: Clearances Required
0"
1"
1"
0"
http://www.northlineexpress.com
2-FT MINIMUM ABOVE
ANY PART OF THE
ROOF WITHIN 10-FT
Fig 1
0"
1"
1"
0"
3.
9 inches
6 inches
6 inches
3 FT MINIMUM FOR SOLID
FUEL APPLIANCES, 2-FT
MINIMUM FOR GAS, OIL,
OR PELLET APPLIANCES.
Insulation
Required
None
None
None
2-ply Sleeve
Toll-Free 1-866-667-8454
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