8. Terminate vent at least 1 ft above grade, including
normal snow line.
9. Multiple direct vent installations require a 4 ft
clearance between the ends of vent caps located
on the same horizontal plane. See Fig. 24.
Installations in Canada
Refer to latest edition of the B149 Installation Code.
A vent shall not terminate:
1. Directly above a paved sidewalk or driveway
which is located between two single-family dwell-
ings and serves both dwellings.
2. Less than 7 ft (2.13 m) above a paved sidewalk or
paved driveway located on public property.
3. Within 6 ft (1.8 m) of a mechanical air supply inlet
to any building.
VENT CAPS STACKED VERTICALLY
FLUE GASES MOVING IN PARALLEL
VENT CAPS ALL AT SAME ELEVATION
FLUE GASES MOVING TOWARD EACH OTHER
VENT CAPS AT STAGGERED ELEVATIONS
FLUE GASES MOVING TOWARD EACH OTHER
1” MINIMUM (TYP)
2” MINIMUM (TYP)
1” MINIMUM (TYP)
DISCHARGE
4’-0” MIN.
(TYP)
4’-0” MIN.
(TYP)
DISCHARGE
Fig. 24: Vent Cap Configurations
WARNING:
The Commonwealth of Massachusetts
requires that sidewall vented heaters, installed in
every dwelling, building or structure used in whole or
in part for residential purposes, be installed using
special provisions as outlined on page 53 of this
manual.
CAUTION:
The inlet water temperature to the
XFyre must not exceed 170ºF at any firing ate to use
the PVC venting option. The venting system must
conform to local codes and/or the current National
Fuel Gas Code ANSI Z223.1/NFPA 54. The system
setpoint must not exceed 180ºF.
28
damaging exterior finishes. Use a 300-series
stainless steel backing plate against brick or
masonry surfaces.
11. DO NOT extend exposed vent pipe outside of
building beyond the minimum distance required
for the vent termination. Condensate could freeze
and block vent pipe.
NOTE:
When using
PVC “T” vent termination
,
insert the two round stainless mesh screens provid-
ed with the unit into the tee.
NOTE:
When
using
Centrotherm
™
Polypropylene “T” vent termination
, insert two
Centrotherm™ termination screens into the dis-
charge end of the tee.
U.S. Installations
Refer to the latest edition of the National Fuel Gas
Code.
Vent termination requirements are as follows:
1. Vent must terminate at least 4 ft below, 4 ft hori-
zontally from or 1 ft above any door, window or
gravity air inlet to the building.
2. The vent must not be less than 7 ft above grade
when located adjacent to public walkways.
3. Terminate vent at least 3 ft above any forced air
inlet located within 10 ft.
4. Vent must terminate at least 4 ft horizontally, and
in no case above or below unless 4 ft horizontal
distance is maintained, from electric meters, gas
meters, regulators, and relief equipment.
5. Terminate vent at least 6 ft away from adjacent
walls.
6. DO NOT terminate vent closer than 5 ft below roof
overhang.
7. The vent terminal requires a 12 in. vent terminal
clearance from the wall.
