Chapter 3 — Stack and Intake Vent Sizing and Installation
Part No. 750-263 3-3
3. Vent Terminal Location
Give special attention to the location of the vent termination to avoid
possibility of property damage or personal injury.
1. Combustion gases can form a white vapor plume in the winter.
The plume could obstruct a window view if the termination is
installed in close proximity to windows.
2. Prevailing winds could cause freezing of condensate and water/
ice buildup on building, plants or roof.
3. The bottom of the vent terminal and the air intake shall be
located at least 24 inches above grade, including normal snow
line.
4. Un-insulated single-wall metal vent pipe shall not be used
outside in cold climates for venting combustion gas.
5. Through-the-wall vents for Category II and IV appliances and
non-categorized condensing appliances shall not terminate over
public walkways or over an area where condensate or vapor
could create a nuisance or hazard or could be detrimental to the
operation of other equipment. Where local experience indicates
that condensate is a problem with Category III appliances, this
provision shall also apply.
6. Locate and guard vent termination to prevent accidental contact
by people and pets.
7. DO NOT terminate vent in window well, alcove, stairwell or other
recessed area, unless previously approved by local authority.
8. DO NOT terminate above any door, window, or gravity air intake.
Condensate can freeze causing ice formations.
Figure 3-1 Horizontal flue thru-wall stack and intake
18" Minimum
24" Minimum
24" Minimum
Air Intake (w/Screen)
Flue Gas Vent (w/Screen)
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