Filter
Top Products
40
WARNING: Contact the vent material manufactur-
er if there are any questions about the appliance cat-
egory or suitability of a vent material for Category II,
III or IV applications. Using improper venting materi-
als can result in personal injury, death or property
damage.
Vent Terminal Location
1. Condensate can freeze on the vent cap. Frozen
condensate on the vent cap can result in a blocked
flue condition.
2. Give special attention to the location of the vent
termination to avoid possibility of property dam-
age or personal injury.
3. Gases may form a white vapor plume in winter.
The plume could obstruct a window view if the ter-
mination is installed near windows.
4. Prevailing winds, in combination with below-freez-
ing temperatures, can cause freezing of con-den-
sate and water/ice build-up on building, plants or
roof.
5. The bottom of the vent terminal and the air intake
shall be located at least 12 in. above grade, includ-
ing normal snow line.
6. Un-insulated single-wall metal vent pipe shall NOT
be used outdoors in cold climates for venting gas
utilization equipment.
7. Through-the-wall vents for Category II and IV
appliances shall not terminate over public walk-
ways or areas where condensate or vapor could
create a nuisance or hazard, or be detrimental to
the operation of regulators, relief valves or other
equipment.
8. Locate and guard vent termination to prevent acci-
dental contact by people or pets.
9. DO NOT terminate vent in window well, stairwell,
alcove, courtyard or other recessed area, unless
previously approved by local authority.
10. DO NOT terminate above any door, window, or
gravity air intake. Condensate can freeze, causing
ice formations.
11. Locate or guard vent to prevent condensate from
damaging exterior finishes. Install a rust-resistant
sheet metal backing plate against brick or mason-
ry surfaces.
12. DO NOT extend exposed vent pipe outside of
building. Condensate could freeze and block vent
pipe.
Condensate Management
Condensate must be routed from the condensate trap
to an appropriate container for neutralization before
disposal, as required by local codes.
Vertical Venting (Category II)
Common Venting System
Manifolds that connect more than one boiler to a com-
mon chimney must be engineered to handle the com-
bined load. Consult available guides for proper sizing
of the manifold and the chimney. At no time should the
area of the vent be less than the area of the largest
boiler exhaust outlet.
NOTE: During winter months check the vent cap
and make sure no blockage occurs from build-up of
snow or ice.
Note: When vertical height exceeds 25 ft,
consult factory prior to installation.
CAUTION: A properly sized listed vent cap termi-
nal must be used to evacuate the flue products from
the boilers.
Fig. 37: Vertical Venting (Category II)