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CAUTION: Make sure you have the proper equipment for the job, including
adequate safety protection for working at elevated heights. Always wear gloves and
safety glasses when handling sheet metal parts.
Proper sizing of the relining system to the appliance is very important. For gas
appliances, refer to the National Fuel Gas Code or the Simpson Dura-Vent Sizing
Handbook for complete sizing instructions (these tables are not intended for Category
II, III or IV appliances or Oil burning appliances). Failure to properly size the venting
system may result in draft hood spillage, back pressure, and corrosive condensation
in the relining system.
If you are burning solid or liquid fuel the venting system may be sized to the outlet of
the appliance. Do not downsize the liner for wood or oil appliances without consulting
the appliance manufacturer. Some pellet burning appliances may require an increase
in diameter size for higher altitudes, but you should consult the appliance manufacturer
for proper sizing of the liner.
Before installing the Dura/Flex SS Liner system, the chimney passageway should be
examined to check for cracked, loose, or missing bricks, mortar, or other materials
that could inhibit correct installation of the lining system. The Chimney should be
cleaned and any tar glaze creosote removed. Verify that the existing masonry
chimney has at least 1" clearance from exterior of the chimney to combustibles and
it meets current NFPA 211 requirements as well as any local code requirements.
Make sure the construction of your masonry chimney meets the following requirements
for your reliner installation:
Minimum brick thickness: 3 1/2 inches
Maximum height: 65 feet
Minimum Height: 10 feet
Clearances from combustible materials for single-wall connectors on Residential-
Type Appliances (from NFPA 211):
Gas appliances without draft hoods
Oil and solid-fuel appliances
Unlisted gas appliances with draft hoods
Oil appliances listed for use with L-Vent
NorthlineExpress.com
SIZING REQUIREMENTS
PRIOR TO INSTALLATION
http://www.northlineexpress.com
2.
18 inches
18 inches
9 inches
9 inches
Toll-Free 1-866-667-8454
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