you should add a synthetic latex
additive. Mix to a firm, moist con-
sistency.
4. Using a plasterer or mason's
trowel, apply a scratch coat that
covers the wire mesh. Let the
mortar set before adding another
coat. This will take several hours.
Afterwards, apply a thinner coat
and the facing. Do not spread
plaster over more than a workable
area so that the mortar will not set
before the facing is applied.
5. If additional mortar is required, use
a grout bag to fill in joints. Care
must be taken to avoid smearing
on the surface of the stone or
brick.
REMOTE VENTING
Heat from the Onyx AP may be vented
to other areas in the home by a num-
ber of ways, with or without a central
heating blower:
The gravity vent system can distribute air to an upper level or to
a room next door without an extra blower. The central heating
option allows heat to be sent up to 50 feet away. (Figure 21)
illustrates various certified ways of incorporating the two systems.
THE GRAVITY VENT SYSTEM (FDVO) (NOT FOR
MOBILE HOME USE)
The FDVO Kit includes:
- A grille
- A grille adaptor
- A B-vent starter section
- A shut-off damper
IMPORTANT: No substitution of any of these parts is allowed.
These genuine RSF Woodburning Fireplaces parts have the cor-
rect clearances. These clearances must be maintained for your
safety.
The FDVO system incorporates standard 8" B-vent components
for installation. Single wall pipe is not allowed due to the
high temperature of the air in a gravity vent system.
Any listed brand of 8" B-vent pipe may be used and is
not a part of the FDVO. The maximum pipe length is 15
ft. from the top of the fireplace to the outlet. You may
also use Excel brand ULTRABlack pipe.
NOTE: If two gravity vent lines are installed, then two
FDVO kits must be ordered.
ONYX AP Owner's Manual
RSF Woodburning Fireplaces
20
Figure 20: Installation of rock retainer (FDKO)
Warning: allow room for the handle and open-
ing the door wide when placing rock facing.
Finishing trim /
stabilizing bracket
Plywood
Hearth
Stone, tile or brick
Mortar
Heavy expanded
metal part FDKO
Wire mesh
Figure 21: Remote venting
No ducting
1 gravity
vent kit
2 gravity
vent kits
Gravity vent and
central heating
duct kit
Central heating
duct kit
Grid adapter
rear side
Grid
“B” vent
starter
Figure 22: Gravity vent kit (FDVO)
8”
