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Damper for Venting Combustion Products From Decorative Appliances
20
Chimney
Height* (ft)
10
11.3
15
8.6
20
7.5
25
6.6
30
6.2
35
5.7
40
5.3
* Height is from hearth to top of chimney and the minimum height is 10 fee.
** Chart shows mainimum opening (sq. in.) for the given height and input rate.
*** Column marked ("Max input" corresponds to the maximum allowable input rate (kBTU/hr) for the given height.
Damper for Venting Combustion Products From Decorative Appliances
20
Chimney
Height* (ft)
6
17.6
8
16.5
10
15.1
15
14.1
20
12.9
30
12.2
* Height is from hearth to top of chimney and the minimum height is 10 fee.
** Chart shows mainimum opening (sq. in.) for the given height and input
6
INSTALLATION Continued
For Factory Built Fireplaces Free Opening Area of Chimney
For Installation In Solid Fuel Burning Fireplaces
Appliance Input Rate (kBTU/hr)
30
40
50
Minimum Opening** (sq. in.)
16.6
22.1
28.3
12.6
17.3
21.2
10.8
14.5
18.1
9.6
12.6
15.9
9.1
11.3
14.5
8.0
10.8
13.2
7.5
10.2
12.6
For Masonry Built Fireplaces Free Opening Area of Chimney
For Installation In Solid Fuel Burning Fireplaces
30
40
50
25.7
33.8
41.7
23.7
31.2
38.7
21.7
28.7
35.2
19.9
26.1
32.0
18.5
23.7
28.8
16.9
21.6
26.5
60
70
80
35.3
44.2
---
26.4
32.2
38.5
22.1
26.4
31.2
18.1
22.9
27.3
17.3
20.4
24.6
15.9
18.9
22.1
15.2
18.1
20.4
Appliance Input Rate (kBTU/hr)
60
70
80
Minimum Opening** (sq. in.)
49.2
56.6
64.0
45.5
52.4
59.7
41.7
48.2
54.3
37.7
43.2
48.8
34.3
39.8
44.4
31.2
35.9
40.3
ihp.us.com
90
100
110
---
---
---
45.4
---
---
37.4
43.0
---
31.2
36.3
43.0
28.3
33.2
37.4
25.5
30.2
34.2
23.8
27.3
31.2
90
100
110
71.4
78.8
86.2
66.9
74.1
81.3
60.2
66.1
72.0
54.1
59.4
64.6
49.1
53.8
58.4
44.5
48.6
52.7
120
Max.
Input***
---
77.6
---
98.2
---
114.2
50.3
121.0
44.2
130.1
39.6
141.2
35.3
158.5
120
93.5
88.6
77.9
69.9
63.0
56.6
901176-00 NC
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