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FOCUS 250 Owner's Manual

RSF Woodburning Fireplaces

CHASE ENCLOSURE

If  the  chimney  runs  up  the  outside  of  the  house,  we
recommend  that  it  be  enclosed  in  a  chase  structure.  The
chase  should  be  constructed  in  such  a  way  that  it  is  an
extension  of  the  home  (see  Figure  13).  It  should  be  well
insulated between the footings and the floor of the home to
prevent heat loss. If the climate in your area is mild, insulate
the chase at least to the first firestop. If the climate in  your
area  is very cold, insulate the chase to the top to keep the
chimney  warmer,  increase  the  draft,  and  reduce  creosote
buildup.  We  also  recommend  insulating  the  ceiling  of  the
chase  just  as  if  it  were  in  the  attic  space.  This  will  prevent
cold air from dropping down through the chase and into the
room where the fireplace is installed (see Figure 13).

Some local codes require that the walls be insulated, vapor
sealed  and  sheathed  with  a  fire  rated  gypsum  board  (see
Figure  13).  We  strongly  recommend  this  procedure  for  all
installations  to  prevent  cold  drafts  from  originating  in  the
fireplace  enclosure.  If  you  follow  this  procedure,  we
recommend that you do not insulate the wall above the front
of the fireplace.



REMEMBER:

Check local codes concerning installation

requirements and restrictions in your area.

MASONRY CHIMNEY

Installing your FOCUS 250 fireplace with a masonry chimney
still requires using EXCEL chimney from the top of the
fireplace to where it will connect to a listed liner that will run
up inside the masonry chimney (see Figure 14).

The stainless steel liner should be fitted inside the clay liner all the way to the top of the masonry chimney. It is not
meant to replace the clay liner. You can use either the EXCEL liner or any other listed liner to ULC-S635, ULC-
S640 or UL-1777.

Special care is to be taken to make sure that you have a good solid connection between the EXCEL chimney and
the liner. A masonry adaptor (FO-FDM7) was designed specifically for that purpose and is available from your RSF
dealer. It will attach to the liner with 3 stainless steel rivets (provided) and to the EXCEL chimney with 3 screws
(provided).

After mortaring in place, the connection
between the EXCEL chimney and the liner
should not be visible in order to isolate the
heat released through the liner from the
fireplace enclosure.

As depicted in Figure 14, you must install
at least one 18" length of EXCEL chimney
after  the  EXCEL  chimney  elbow.  The
uppermost  part  of  the  EXCEL  chimney  -
where  it  enters  the  masonry  chimney  -
must be a minimum of 12" from the ceiling.



NOTE:

If the ceiling is high enough, you

can install one or more EXCEL chimney
lengths directly on the fireplace before the
elbow.

If you use a flexible liner, make sure to be
careful when cleaning to ensure that the
stainless steel flexible liner is not
dislodged in any way.

Figure 13 Chimney Installed with a Chase
Enclosure Example

Figure 14 Connection to a Masonry Chimney

10'

2' min.

Optional
Decorative
Shroud

Insulation

Chase liner of fire rated
gypsum board is
recommended (may be
required by local authorities)