Operating Guide

17
FIREPLACE PREPARATION
FOR FACTORY BUILT FIREPLACES
Free Opening Area of Chimney Damper For Venting Combustion Products From
Decorative Appliances For Installation In Solid-Fuel Burning Fireplaces
Appliance Input Rate
(kBTU/hr)
30
40
50
Chimn e y
Height* (ft)
Minimum Opening** (sq. in.)
10
16.6
22.1
28.3
15
12.6
17.3
21.2
20
10.8
14.5
18.1
25
9.6
12.6
15.9
30
9.1
11.3
14.5
35
8.0
10.8
13.2
40
7.5
10.2
12.6
* Height is from hearth to top of chimney and the min i mum height is 10 feet.
** Chart shows min i mum opening (sq. in.) for the given height and input rate .
FOR MASONRY BUILT FIREPLACES
Free Opening Area Of Chimney Damper For V enting Combustion Products
From Decorative Appliances For Installation In Solid-Fuel Burning
Fireplaces
Appliance Input Rate
(kBTU/hr)
30
40
50
Chimn e y
Height* (ft)
Minimum Opening** (sq. in.)
6
25.7
33.8
41.7
8
23.7
31.2
38.7
10
21.7
28.7
35.2
15
19.9
26.1
32.0
20
18.5
23.7
28.8
30
16.9
21.6
26.5
* Height is from hearth to top of chimney and the minimum height is 6 feet.
** Chart shows min i mum opening (sq. in.) for a given height and input rate.