18-DE01D1-8 15
Installer’s Guide
Reduction of Clearances with Specified Forms of Protection
Type of Protection Allowable Clearance with
Specified Protection (in.)
Applied to and covering all
surfaces of combustible material
within the distance specified as
the required clearance with no
protection. See Figure 11.
Where the required clearance
with no protection from the
appliance or chimney
connector is: 9 inches
Above Sides & Rear
a. 3 -1/2" thick masonry wall
without ventilation air space.....
--- 6
b. 1/2" insulation board over 1"
glass fiber or mineral wool
batts.....
65
c. 0.024 (24 gauge) sheet metal
over 1" glass fiber or mineral wool
batts reinforced with wire on rear
face with ventilated air space.....
53
d. 3 - 1/2" thick masonry wall with
ventilation air space.....
--- 6
e. 0.024 (24 gauge) sheet metal
with ventilated air space.....
53
f. /2" insulation board with
ventilated air space....
53
g. 0.024 (24 gauge) sheet metal
with ventilated air space over
0.024 (24 gauge) sheet metal with
ventilated air space.....
53
h. 1" glass fiber or mineral wool
batts sandwiched between two
sheets 0.024 (24 gauge) sheet
metal with ventilated air space
53
A. Equal the required clearance with no protection.
B. Equals the reduced clearance permitted in accordance with the
preceeding clearance chart.
C. The protection applied to the construction that covers the
combustible material should extend far enough in each direction
to make C equal to A.
T
h
e
v
e
n
t
co
nn
e
c
t
o
r
p
i
p
e
b
e
t
w
ee
n
t
h
e
f
u
r
n
a
c
e
a
n
d
c
h
i
m
n
e
y
s
h
a
ll
b
e
of
e
q
u
a
l
d
i
a
m
e
t
e
r
a
s
t
h
e
f
l
u
e
o
u
t
l
e
t
of
t
h
e
f
u
r
n
a
c
e
.
The vent connector pipe must be made o
f
2
4
gauge (or thicker ) corrosion-resistant steel.
T
h
e
v
e
n
t
co
nn
e
c
t
o
r
p
i
p
e
s
h
o
u
l
d
b
e
a
s
s
h
o
r
t
a
s
p
o
ss
i
b
l
e
a
n
d
i
n
s
t
a
ll
e
d
s
o
t
h
a
t
i
t
h
a
s
a
co
n
t
i
nu
o
u
s
r
i
s
e
f
r
o
m
t
h
e
f
u
r
n
a
c
e
t
o
t
h
e
c
h
i
m
n
e
y
.
T
h
e
h
o
r
i
z
o
n
t
a
l
l
e
n
g
t
h
of
a
co
nn
e
c
t
o
r
t
o
a
n
a
t
u
r
a
l
d
r
a
f
t
c
h
i
m
n
e
y
o
r
v
e
n
t
s
e
r
v
i
n
g
a
s
i
n
g
l
e
a
pp
li
a
n
c
e
s
h
a
ll
n
o
t
b
e
m
o
r
e
t
h
a
n
75
p
e
r
c
e
n
t
of
t
h
e
h
e
i
g
h
t
of
t
h
e
v
e
r
t
i
c
a
l
p
o
r
t
i
o
n
of
t
h
e
c
h
i
m
n
e
y
o
r
v
e
n
t
a
b
o
v
e
t
h
e
co
nn
e
c
t
o
r
.
E
l
b
o
w
s
s
h
o
u
l
d
b
e
m
i
n
i
m
i
z
e
d
a
n
d
t
h
e
p
i
p
e
s
h
o
u
l
d
b
e
j
o
i
n
e
d
w
i
t
h
m
e
t
a
l
s
c
r
e
w
s
a
n
d
s
u
pp
o
r
t
e
d
b
y
s
t
r
a
p
s
.
A
ll
h
o
r
i
z
o
n
t
a
l
r
un
s
of
v
e
n
t
co
nn
e
c
t
o
r
p
i
p
e
s
h
o
u
l
d
b
e
p
i
t
c
h
e
d
u
p
w
a
r
d
a
m
i
n
i
m
u
m
of
1
/
4
i
n
c
h
p
e
r
foo
t
of
r
un
.
A
t
h
i
m
b
l
e
s
h
o
u
l
d
b
e
u
s
e
d
t
o
co
nn
e
c
t
t
h
e
v
e
n
t
co
nn
e
c
t
o
r
p
i
p
e
t
o
t
h
e
c
h
i
m
n
e
y
s
o
t
h
e
p
i
p
e
m
a
y
b
e
r
e
a
d
il
y
r
e
m
o
v
e
d
i
n
c
a
s
e
of
i
n
s
p
e
c
t
i
o
n
o
r
r
e
p
l
a
c
e
m
e
n
t
.
S
ee
F
i
g
. 10.
A
ll
c
h
i
m
n
e
y
c
l
e
a
n
-o
u
t
d
oo
r
s
a
n
d
f
l
u
e
co
nn
e
c
t
i
o
n
s
m
u
s
t
f
i
t
t
i
g
h
t
l
y
s
o
t
h
e
y
w
ill
s
e
a
l
t
o
a
v
o
i
d
a
i
r
l
e
a
k
s
.
I
f
c
h
i
m
n
e
y
f
l
u
e
s
a
r
e
d
i
v
i
d
e
d
o
r
t
h
e
r
e
a
r
e
m
u
l
t
i
p
l
e
f
l
u
e
s
w
i
t
h
i
n
o
n
e
c
h
i
m
n
e
y
,
m
a
k
e
s
u
r
e
t
h
e
r
e
a
r
e
n
o
o
p
e
n
i
n
g
s
i
n
t
h
e
p
a
r
t
i
t
i
o
n
s
e
p
a
r
a
t
i
n
g
t
h
e
d
i
v
i
d
e
d
o
r
i
n
d
i
v
i
d
u
a
l
f
l
u
e
s
.
T
h
e
v
e
n
t
co
nn
e
c
t
o
r
p
i
p
e
m
u
s
t
n
o
t
p
a
ss
t
h
r
o
u
g
h
a
co
m
b
u
s
t
i
b
l
e
w
a
ll
o
r
p
a
r
t
i
t
i
o
n
un
l
e
ss
a
d
e
q
u
a
t
e
p
r
o
t
e
c
t
i
o
n
i
s
p
r
o
v
i
d
e
d
a
t
t
h
e
p
a
ss
a
g
e
w
a
y
.
A
n
a
cc
e
p
t
a
b
l
e
p
a
ss
a
g
e
w
a
y
co
u
l
d
b
e
e
i
t
h
e
r
a
n
a
pp
r
o
v
e
d
,
v
e
n
t
il
a
t
e
d
m
e
t
a
l
t
h
i
m
b
l
e
w
h
i
c
h
i
s
a
t
l
e
a
s
t
12
i
n
c
h
e
s
l
a
r
g
e
r
i
n
d
i
a
m
e
t
e
r
t
h
a
n
t
h
e
v
e
n
t
co
nn
e
c
t
o
r
p
i
p
e
,
o
r
b
r
i
c
k
w
o
r
k
w
h
i
c
h
i
s
a
t
l
e
a
s
t
8
i
n
c
h
e
s
t
h
i
c
k
co
n
s
t
r
u
c
t
e
d
i
n
t
o
t
h
e
w
a
ll
a
n
d
s
u
rr
o
un
d
i
n
g
t
h
e
v
e
n
t
co
nn
e
c
t
o
r
p
i
p
e
.
(
S
ee
F
i
g
. 10
)
.
Suggested method to acommodate ve
connector passage through a wall
composed of combustible material.
0
lternate construction that allows reduce
d
clearances to combustible materials.
q
To Next Page
Loading...
