d. Vent terminal shall not be located over public
walkways where condensate could create a
nuisance or hazard.
e. When adjacent to a public walkway, vent
terminal shall be at least 7 feet (2.1 meters)
above grade.
f.
Vent terminal shall be located at least 4 feet (1.2
meters) horizontally from electric meters, gas
meters, regulators and relief equipment. In
Canada, this dimension must be 6 feet (2 meters).
g. Vent terminal should not be located directly
under roof overhangs to prevent icicles from
forming.
6. Vent Pipe Assembly:
a. Horizontal portions of the vent pipe shall slope
downward
from the boiler to the vent
termination elbow, not less than 1/4" per foot
(21 mm per meter). If any horizontal portions of
the vent pipe instead slope toward boiler, provide
a horizontal drain tee as per instructions in
section D. Direct Exhaust; Vertical Venting.
Parties horizontales de l'évent doit s'incliner vers
le bas de la chaudière à la terminaison de
ventilation (coude), pas moins de 1/4 "par pied
(21 mm par mètre).
Si les parties horizontales de l'évent au lieu pente
vers la chaudière, prévoir un tee drain horizontal
en suivant les instructions de la section D.
échappement direct, évacuation verticale.
b. Support horizontal portions of the venting system
to prevent sagging by use of metal strapping or
equivalent means. Do not screw into the vent pipe.
Fournir un support à toute portion horizontale du
système d’évacuation à l’aide de courroies de
metal ou une méthode équivalente afin de
l’empêcher de s’affaisser. Ne pas visser dans le
tuyau de ventilation.
• Horizontal portions of the vent pipe must be
supported at intervals no greater than four
feet to prevent sagging/separation.
Parties horizontales du conduit d'évacuation
doit être soutenu à intervalles ne dépassant
pas quatre pieds pour éviter tout affaissement /
séparation.
• Secure vent pipe to the thimble/wall to
prevent possible movement from incidental
contact on the vent terminal.
c. Type vent material approved is AL29-4C, 3 inch
(76 mm) diameter stainless steel; manufactured
by Heat-Fab
®
(Saf-T-Vent); Z-Flex
®
(Z-Vent);
ProTech (FasNSeal™); Flex-L (StaR-34); Metal-
Fab (Corr/Guard).
d. Attach the fan adapter to blower outlet flange
using gasket and 1/4" (6 mm) -20 nuts and
washers, (parts located in miscellaneous parts
box).
e. Refer to Figure 4.3 that lists special vent adapters
for connection to boiler fan adapter. These
special adapters are not supplied with boiler.
f.
Attach vent pipe adapter to boiler fan adapter by
applying a 1/4" (6 mm) bead of high temperature
silicone around diameter of fan adapter and slip
vent pipe adapter over the fan adapter. Fill in
any voids with silicone and smooth out with
moistened finger or flat tool.
g. If using Z-Flex
®
pipe, slide vent pipe over the first
2-1/2" (64 mm) of the fan adapter and secure
joint connection with the Z-Flex
®
looking bands
making sure that locking band has contact with
fan adapter at boiler end and vent pipe.
h. Attach remaining pipe and fittings per
manufacturer’s vent instructions. Use only the
silicone recommended by the vent pipe
manufacturer.
Figure 4.1: Chimney Venting
VENTING
14
