Operating instructions

20
TABLE 1A
for
FACTORY BUILT FIREPLACES
Free opening area of chimney damper for venting combustion products from decorative appliances for
installation in solid fuel burning fireplaces.
TABLE 2A
for
MASONRY BUILT FIREPLACES
Free opening area of chimney damper for venting combustion products from decorative appliances for
installation in solid fuel burning fireplaces.
MINIMUM PERMANENT FREE OPENING IN SQUARE INCHES
Chimney
Height (Feet)
10
15
20
25
30
35
40
18” Log Set
LP Gas
16.6
12.6
10.8
9.6
9.1
8
7.5
18” Log Set
Natural Gas
16.6
12.6
10.8
9.6
9.1
8
7.5
24” Log Set
LP Gas
22.1
17.3
14.5
12.6
11.3
10.8
10.2
24” Log Set
Natural Gas
22.1
17.3
14.5
12.6
11.3
10.8
10.2
33” Log Set
LP Gas
22.1
17.3
14.5
12.6
11.3
10.8
10.2
33” Log Set
Natural Gas
22.1
17.3
14.5
12.6
11.3
10.8
10.2
MINIMUM PERMANENT FREE OPENING IN SQUARE INCHES
Chimney
Height (Feet)
6
8
10
15
20
30
18” Log Set
LP Gas
25.7
23.7
21.7
19.9
18.5
16.9
18” Log Set
Natural Gas
25.7
23.7
21.7
19.9
18.5
16.9
24” Log Set
LP Gas
33.8
31.2
28.7
26.1
23.7
21.6
24” Log Set
Natural Gas
33.8
31.2
28.7
26.1
23.7
21.6
33” Log Set
LP Gas
33.8
31.2
28.7
26.1
23.7
21.6
33” Log Set
Natural Gas
33.8
31.2
28.7
26.1
23.7
21.6