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Venting and Combustion Air Guide
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AERCO International, Inc.
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100 Oritani Dr.
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Blauvelt, NY 10913
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Ph.: 800-526-0288
07/21/11
Federal Codes have categorized gas appliances by the vented flue gas pressure and temperature as
follows:
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Category I
, being a gas appliance that operates with a non-positive vent (or natural drafted vent)
connector with a flue gas pressure and temperature at least 140°F (60°C) above its dew point.
•
Category II
, being a gas appliance that operates with a non-positive vent (or natural drafted vent)
connector with a flue gas pressure and temperature less than 140°F (60°C) above its dew point.
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Category III
, being a gas appliance that operates with a positive vent (fan forced vent) connector
with a flue gas pressure and temperature at least 140°F (60°C) above its dew point.
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Category IV
, being a gas appliance that operates with a positive vent (fan forced vent) connector
with a flue gas pressure and temperature less than 140°F (60°C) above its dew point.
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Direct Vent
, a gas appliance is constructed and installed so that all air for combustion is derived
directly from the outdoors and all flue gases are discharged to the outdoors.
1.3 CERTIFIED VENTING MATERIALS FOR FLUE PIPE SYSTYEMS
Acceptable materials and manufacturers for flue vent pipe systems are listed below in Option #1 and
Option #2.
The Vent Pipe Systems below are used for venting gas burning Category IV
appliances. Do not use these vent pipe systems for venting appliances burning
fuels such as wood, coal, oil or kerosene.
Maintain clearances from combustible construction for heater, vent connector,
and steam and hot-water pipes.
Do not use these vent pipe systems for incinerators of any kind.
Do not vent Innovation systems using the same vent piping as being used for
either AERCO Benchmark or KC boilers.
OPTION #1 - AL29-4C STAINLESS STEEL
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Flex-L International Inc., StaR 34 Vent
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Heat-Fab Inc., Saf-T Vent
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Z-Flex Z-Vent
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Protech System Inc., Fas N Seal Vent
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Metal-Fab Inc., Corr/Guard Vent
OPTION #2 – NON-METALLIC – Use Schedule 40 or thicker, Single-wall, Uninsulated pipes
When using Non-Metallic (Plastic) vent systems for Canadian installations, per CSA B149.1,use vent
systems that are certified to the Standard for Type BH Gas Venting Systems, ULC-S636. The plastic
components, primers and glues of the certified vent system must be from a single system manufacturer
and not inter-mixed with other manufacturers vent system parts.
1. PVC
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ASTM F891
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ASTM D2665
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ASTM D1785
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ASTM D2241
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