38
TRIAD Boiler Systems, Inc.
West Chicago, IL
www.triadboiler.com
Draft:
The difference between the “stack effect” of your stack and the pressure drop of your stack.
Stack effect:
Flue gasses are hotter & buoyant compared to ambient air.
Both draft & furnace-pressure are measured at the stack connector. However it should be evident that
the two terms have completely different meanings. This is typically measured with a manometer (Supplied
by others).
Your new boiler is supplied with a forced draft burner capable of supplying all the air for combustion when
operating at reasonable amount of draft. The boiler shall be connected to a vent having sufficient draft
at all times to ensure safe and proper operations of the unit. For details on the relationship between draft
and burner operation, refer to your burner manual or consult a professional. The furnace pressure
(negative gauge value) should be between 0.03” and 0.6” WC at the stack connector.
Stack installation and adjustment are the responsibility of the installer. The installation of your venting
system should be conducted by a professional installer who can properly balance the draft of your system
with the tuning of your burner. Draft can dramatically impact the adjustment of your burner on a seasonal
basis. Draft values and draft control vary depending on the configuration of your stack, weather
conditions, firing rate of your boiler, and many other variables.
4.11 Vent material selection
TRIAD recommends the use of type-L UL listed ducting systems installed by a professional contractor.
Type-L is a UL listing category. The “L” stands for low temperature, defined as less than 1,000 degrees
Fahrenheit in continuous operation. Type-L ducts are double wall construction with at least a one inch
between the liner (inside wall) and a shell (outside wall). Single wall construction can be used, but the
heat losses, potential fire hazards, and risks to people become problematic. A properly insulated ducting
system minimizes heat losses that can vary draft due to changing weather conditions and minimize heat
risks to personnel.
Materials:
Liner for gas, liquid petroleum and #2 oil: stainless steel
The shell should be made from stainless 316. Specific selection is determined upon your environment
and local codes.
Thickness:
Liner should be 20 gauge up to 36” diameter. 18 gauge over 36” diameter.
Shells can vary from 26 gauges to 18 gauges depending on diameter, construction style, and structural
installation choices. The UL Type-L listing process specifics an amount of incidental contact protection
that is a good recommended standard.
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