FOCUS ST Owner's Manual
12
RSF Woodburning Fireplaces
FRAMING
The enclosure walls can be framed with any suitable
materials (2"x4" or 2"x6" studs, plywood, gypsum
board, etc.). Because of the high heat output
potential of the FOCUS ST, combustible materials
must NOT go closer to the fireplace than the
standoffs, on the top, back and sides. See Figure 6
for recommended framing dimensions.
You may also completely cover the top of a FOCUS
ST as long as you maintain all fireplace standoff
clearances and the 2" clearances around the
chased chimney. The 2" clearance around the
chimney must be open from the fireplace up to the
ceiling. See Figure 5 for an example of a close
clearance installation.
Under no circumstances should the distance
between the ceiling firestop and the base fireplace be less than the dimension specified in Table 1 (C).
The framing dimensions are larger than required for ease of installation.
Figure 6 FOCUS ST Framing Example
OUTSIDE AIR DUCT
After the fireplace is correctly positioned, connect the
outside air inlet to the outside (see Figure 7).
Use an insulated aluminium flexible duct rated at over
200°F (93°C). The duct should not exceed 12' vertical
rise above the base of the unit. We suggest using the
4" RSF outside air kit (FO-INT).
The air inlet should always be at least 5' lower than
the chimney rain cap and must never terminate in
attic spaces.
A 4" diameter duct can be used if the total duct run is
less than 25'. For longer runs, use 5" diameter duct.
Both 4" and 5" connecting sleeves are provided with
the fireplace.
1. Find a convenient location for the combustion air
duct and outside air inlet. The outside air inlet can
be above or below floor level (see Figure 7).
45 1/4"
37 1/4"
21 3/4"
Figure 5 Close Clearance Installation of a FOCUS ST
Figure 7 Outside Air Connection and Installation
Example
Always maintain 2" min.
clearance with chimney
Always respect the
fireplace standoffs
Leave the space between
the chimney and the
framing open (no firestop)
Above Floor
Example
Below Floor
Example
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2" Aluminium
Duct Tape
Insulated Flexible Air Duct
Outside Wall
Outside Air
Inlet
