Chase Enclosure - RSF Woodburning Fireplaces ONYX AP Owner's Manual

to the Excel chimney with the 3 screws provided. The stainless steel liner fits inside the clay liner all the way to the
top of the masonry chimney. It is not meant to replace the clay liner. After mortaring in place, the connection should
not be visible. Care must be taken when cleaning to ensure that the stainless steel flex liner is not dislodged.
As depicted in (Figure 9), the metal chimney is to be a minimum of 18" from the connection point at the elbow to
the masonry adaptor. The uppermost part of the metal chimney where it enters the masonry chimney must be a
minimum of 12 inches from the ceiling.
1. Sight-in and mark the outline of where the factory built chimney will penetrate the masonry chimney.
2. Using a large (3/4" - 2") masonry drill bit, drill a hole exactly in the center of the oval outline. With a masonry
hammer and drill, slowly enlarge the hole to the size required. Work from the center out. Be especially careful
with the clay liner behind the brick because three sides of it must stay in place.
3. Bring the stainless steel liner down from the top of the chimney. If you are using a rigid liner you will need
enough room to secure an elbow to it with at least two screws. For chimneys with less than 10" X 10" inside
you may find it easier to install a flex liner and secure the end with a special adapter (part #LAF) available from
your dealer.
4. Move the fireplace forward enough to install the length of EXCEL chimney and then move the fireplace back
into position as you connect the masonry adaptor to the EXCEL chimney.

CHASE ENCLOSURE

If the chimney runs up the outside of the house, it must be enclosed in a chase structure. The chase should be
constructed in such a way that it is an extension of the home, and is well insulated between the footings and the
floor of the home, to prevent heat loss. Insulate the chase to the first firestop to prevent heat loss in mild climates.
In cold climates, the chase could be insulated to the top to keep the flue warmer and increase draft. It is best to
locate a chase away from any overhead obstructions and meet all clearances from such objects (See Figure 10).
10 ft.
Vented flashing
with storm collar
2 ft.
Floor
Onyx AP
Beneath hearth
extension
(see page 17)
Figure 11: Offset chimney through a wall
ONYX AP Owner's Manual
Storm
12" min.
collar
Radiation
shield
Radiation
shield and
offset, roof
or wall sup-
port
Figure 12: Offset chimney installation
14
Offset
Use offset
support
RSF Woodburning Fireplaces
Radiation
shield with
offset support
Rise
Radiation
shield
3 metal screws
in each joint