14 - VENT CLEARANCES
Figure 17A - Direct Vent Termination Clearances
DIRECT
VENT
TERMINATION
CLEARANCES
C
le
ar
ance
C
anadian I
nstal
la
ti
ons - 1
US I
nstal
la
ti
ons -2
A =
Cle
ara
nce a
bo
ve grade
, v
era
nda, p
or
ch,
dec
k, o
r balco
ny
12 inc
hes (30cm)
12 inc
hes (30cm)
B =
Cle
ara
nce t
o windo
w
o
r do
or
th
at
ma
y b
e
op
en
ed
6 inc
hes (15cm) f
or a
pp
lia
nces
< 10,000 B
tuh (3kW),
12 inc
hes (30 cm) f
or a
pp
lia
nces > 10,000 B
tuh (3kW) a
nd
< 100,000 B
tuh (30kW),
36 inc
hes (91cm) f
or a
pp
lia
nces > 100,000 B
tuh (30kW)
6 inc
hes (15cm) f
or a
pp
lia
nces
< 10,000 B
tuh (3k
W),
9 inc
hes (23 cm) f
or a
pp
lia
nces > 10,000 B
tuh (3kW) a
nd
< 50,000 B
tuh (15kW),
12 inc
hes (30 cm) f
or a
pp
lia
nces > 50,000 B
tuh (15kW)
C =
Cle
ara
nce t
o p
er
m
an
en
tly c
los
ed windo
w
*
*
D =
V
er
tical c
le
ara
nce t
o v
en
tila
ted s
offi
t
lo
ca
te
d
ab
ov
e t
he t
er
mina
tio
n wi
thin a ho
rizo
nt
al
dist
an
ce o
f 2 f
eet (61 cm) f
ro
m
th
e cen
ter
line o
f t
he t
er
mina
tio
n
**
E =
Cle
ara
nce t
o un
ve
ntila
ted s
offi
t
*
*
F =
Cle
ara
nce t
o o
utside co
rn
er
*
*
G =
Cle
ara
nce t
o in
side co
rn
er
*
*
H =
Cle
ara
nce t
o e
ac
h side o
f cen
ter line ex-
te
nded a
bo
ve met
er/r
egula
to
r ass
em
bl
y
3 f
eet (91 cm) wi
thin a heig
ht
15 f
eet (4.5 m) a
bo
ve t
he
met
er/r
egula
to
r.
*
I =
Cle
ara
nce t
o s
er
vice r
egula
to
r v
en
t o
ut
let
3 f
eet (91 cm)
*
J =
Cle
ara
nce t
o no
n-mec
ha
nical a
ir su
pp
ly
inlet t
o b
uildin
g o
r t
he co
m
bustio
n a
ir inlet
to
a
ny o
ther a
pp
lia
nce
6 inc
hes (15 cm) f
or a
pp
lia
nces < 10,000 B
tuh (3kW),
12 inc
hes (30 cm) f
or a
pp
lia
nces > 10,000 B
tuh (3kW) a
nd
< 100,000 B
tuh (30 kW),
36 inc
hes (91 cm) f
or a
pp
lia
nces > 100,000 B
tuh (30 kW)
6 inc
hes (15 cm) f
or a
pp
lia
nces < 10,000 B
tuh (3kW),
9 inc
hes (23 cm) f
or a
pp
lia
nces > 10,000 B
tuh (3kW) a
nd
< 50,000 B
tuh (15 kW),
12 inc
hes (30 cm) f
or a
pp
lia
nces > 50,000 B
tuh (15 kW)
K =
Cle
ara
nce t
o mec
ha
nical a
ir su
pp
ly
inlet
6 f
eet (1.83 m)
3 f
eet (91 cm) a
bo
ve if wi
thin 10 f
eet (3m) ho
rizo
nt
all
y
L =
Cle
ara
nce a
bo
ve pa
ve
d side
walk o
r pa
ve
d
dr
iv
ew
ay
lo
ca
te
d o
n p
ub
lic p
ro
per
ty
7 f
eet ( 2.13m) +
*
M =
Cle
ara
nce under v
era
nda, p
or
ch, dec
k o
r
balco
ny
12 inc
hes (30 cm) ++
*
1 I
n
acco
rd
an
ce wi
th
t
he c
ur
ren
t CSA B149.1.1, N
at
ural Gas a
n
d P
ro
pa
n
e I
n
st
alla
tio
n C
ode
2 I
n
acco
rd
an
ce wi
th
t
he c
ur
ren
t ANS
I Z223.1/NFP
A 54, N
atio
n
al F
uel Gas C
ode
+ A v
en
t shall no
t t
er
mina
te dir
ec
tl
y a
bo
ve a side
walk o
r pa
ve
d dr
iv
ew
ay
t
ha
t is lo
ca
te
d b
etw
een tw
o sin
gle fa
mil
y d
w
ellin
gs a
nd s
er
ves b
ot
h
d
w
ell-
in
gs.
++ P
er
m
it
te
d o
n
ly
if v
era
nda, p
or
ch, dec
k o
r balco
ny
is f
ull
y o
p
en o
n
a minim
um o
f tw
o sides b
ene
at
h t
he fl
oo
r
* F
or c
le
ara
nces no
t sp
ecifi
ed in ANS
I Z223.1/NFP
A 54 o
r CSA B149.1, t
he f
ollo
w
in
g st
at
emen
t shall b
e inc
luded:
"Cle
ar
an
ce in acco
rd
an
ce wi
th
lo
cal in
st
alla
tio
n co
des a
n
d t
he r
eq
uir
emen
ts o
f t
he gas su
pp
lier a
n
d t
he ma
nufac
tu
rer's in
st
alla
tio
n
in
str
uc
tio
n
s."
27
