Vent Terminal Location - CleaverBrooks CFC-500 Operation, Service And Parts Manual

Vent material should be appropriate for the Appliance Category.
Application-specific information will further determine the material
selected.
In some cases, PVC/CPVC material meeting ULC Type BH Class IIB
specifications may be used. Use of PVC/CPVC depends on operating
conditions, specific vent suppliers, and any local codes having
jurisdiction. Refer to vent manufacturer 's specifications for
applicability.

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.
9. Locate or guard vent to prevent condensate from damaging
exterior finishes. Use a 2' x 2' rust resistant sheet metal backing
plate against brick or masonry surfaces.
10. DO NOT extend exposed stack pipe outside of building. In
winter conditions condensate could freeze and block stack
pipe.
11. Multiple direct stack installations require a four (4) foot
clearance between the stack caps, center to center.
U.S. Installations- Refer to latest edition of the National Fuel Gas
Code.
Vent termination requirements are as follows:
Part No. 750-263
Section 3 — Stack and Intake Vent Sizing and Installation
3-3