FOCUS ST Owner's Manual
13
RSF Woodburning Fireplaces
2. Make a 4 ¼" (5 ¼" if using a 5" diameter duct) hole in the outside wall of the house. Push the outside air inlet
in from the outside. Seal the joint between the air inlet and the outside wall with an appropriate sealant.
3. Place the insulated flexible duct over the round sleeve on the outside air inlet. At both ends, carefully pull back
the insulation and plastic cover, exposing the flexible duct. Then at each end, attach the duct with metal screws
to the inlet and tube. Carefully push the insulation and cover back over the duct. Tape the plastic cover in place
with 2" aluminium duct tape.
You can make a cold air trap by looping the outside air duct as shown in Figure 4.
❖
CAUTION: WHEN RUNNING THE DUCT AROUND CORNERS, BE SURE TO PREVENT CRIMPING THE
DUCT IN A WAY THAT WOULD RESTRICT THE COMBUSTION AIR FLOW.
CHIMNEY
This fireplace is certified for use with 8" ICC Model EXCEL chimney only. Please refer to Table 1 (D-E) for the
minimum and maximum chimney heights permitted with the FOCUS ST fireplace.
We recommend that the minimum height be increased by approximately 6" for every 1000' elevation above sea
level. Every 15°, 30° or 45° offset (one pair of elbows) also increases the minimum height. See Table 2 for more
precise recommended flue heights.
For example, if you are living 6015' above sea level, your chimney should terminate at least 15' from the top of the
fireplace if it is a straight chimney or at least 18'6" if one 30° offset is used as shown in Table 2.
Table 2 Minimum Recommended Flue Heights
Elevation (ft)
Number Of Offset
Straight
Chimney
1 x 15°
2 x 15°
1 x 30°
2 x 30°
1 x 45°
2 x 45°
0 - 1000
Minimum
12’
13’
14’
15’
18’
16’
20’
1001 - 2000
12’6”
13’6”
14’6”
15’6”
19’
16’6”
20’
2001 - 3000
13’
14’
15’
16’
19’6”
17’
21’6”
3001 - 4000
13’6”
14’6”
15’6”
17’
20’
18’
22’6”
4001 - 5000
14’
15’
16’
17’6”
21’
18’6”
23’
5001 - 6000
14’6”
15’6”
17’
18’
21’6”
19’
24’
6001 - 7000
15’
16’
17’6”
18’6”
22’
20’
24’6”
7001 - 8000
15’6”
16’6”
18’
19’
23’
20’6”
25’6”
8001 - 9000
16’
17’
18’6”
20’
24’
21’
26’6”
9001 - 10000
16’6”
17’6”
19’
20’6”
24’6”
22’
27’
Flue height is measured from the top of the fireplace to the top of the chimney before installing the rain cap.
If you have two different offsets (two pairs of different elbows), simply use the column for two offsets of the biggest
pair of elbows at your elevation to get your Minimum Flue Height.
CHIMNEY INSTALLATION
Make sure to read the EXCEL Chimney installation manual concerning requirements for supports, bracing, anchors,
etc. The EXCEL installation manual is available from your dealer or from our web site: www.icc-rsf.com. Refer to
Table 1 (F) for the maximum chimney height that can be supported by the top of the fireplace.
❖
WARNING: THE CLEARANCE BETWEEN THE CHIMNEY AND COMBUSTIBLE MATERIAL MUST BE 2"
OR MORE. DO NOT FILL THIS AREA WITH INSULATION.