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Figure 4 Horizontal Venting With Upward C.) Requirements For Horizontal Venting
Pitch
1. Horizontally Vented heaters perform as
Category III Appliances. This type of
ventin
g
s
y
stem follows special ventin
g
criteria:
a.
)
All residential horizontal installed
heaters shall be vented with either 4 in.
(10.2cm) B-0 double wall vent pipe, 3 in.
(7.2cm) AL29-4C stainless steel or and
a
g
enc
y
certified cate
g
or
y
III ventin
g
s
y
stem.
Certified category III systems can be pur-
chased from your vent pipe distributor . Be
Figure 5 Downward Pitch with Drip Leg sure to follow the manufactures installa-
tion instructions for the category III vent.
The minimum vent length for this system is
3 ft. (1.0m) and the maximum length is
8 ft.
(
2.4m
)
. A Gar
y
Steel #1092 or
Breident A1092, Type L vent caps may
be used.
b.
)
All commercial and industrial horizon-
tall
y
vented heaters ma
y
use either
certified cate
g
or
y
III ventin
g
s
y
stem or
single wall galvanized or stainless steel
vent. Should unrecognized single wall be
used, all joints must be sealed with metallic
tape or a silicone suitable for temperatures
above 400˚F
(
202˚C
)
. Tape must be
Figure 6 Downward Pitch Condensation wrapped at least 2 times around the vent
Drips Out End pipe. Insulate single wall vent pipe
exposed to cold air or running through
unvented areas. 3 in. (7.62cm) vent caps
may be used in this application.
2.)
Residential: Minimum vent length is 3 ft.
(1.0m) and maximum vent length is 8 ft.
(2.4m) of 4 in. (10.2cm) vent pipe. A 3 in.
(7.6cm) to 4 in. (10.2cm) bell increaser will
be required and 4 in. (10.2cm) vent cap.
Commercial/Industrial: Minimum vent
length is 5 ft. (1.5m) and the maximum vent
length is 30 ft. (9.1m). Each 3 in. (7.6cm)
elbow is approximately equal to 1 ft. (.34m).
9