central heat option allows heat to be sent up to 50 ft.
away. (Figure 26) illustrates various certified venting
options.
THE GRAVITY VENT SYSTEM (FDVD)
The FDVD Kit (see figure 27) includes:
- a grille
- a grille adapter
- 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 correct clearances. These
clearances must be maintained for your safety exept
that B-vent components can be replace by ICC dou-
ble wall black pipe ULTRABlack UBF (use only UBF
black pipe).
The FDVD system incorporates standard 8" B-vent com-
ponents 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 FDVD . The maximum pipe length
is 15 ft. from the top of the fireplace to the outlet.
Remember: double wall black pipe from ICC may be
used instead of B-vent pipe.
(Figure 28) indicates the minimum clearances
and framing dimensions. Passing through a
combustible wall or ceiling requires a minimum
clearance of 2" from combustibles.
Warning: Every measurement and clearance
on the illustrations must be followed to
assure safety of the installation.
NOTE: When using wider lintel bar for heavier rock,
make sure that you have enough room to open the door
wide.
2. Cover any remaining area which you wish to put fac-
ing material on with wire mesh, or metal lath, over-
lapping the heavy expanded metal. Make sure nails
or staples used for fastening mesh penetrate the
studs at least 1".
3. Mortar must be "thin set" or "thin bed" type, inherent-
ly polymer modified. Do not add water to the mixture
(this applies to the grout as well). If the mortar is not
modified, you should add a synthetic latex additive.
Mix to a firm, moist consistency.
4. Using a plasterer’s 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 fac-
ing. 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 the joints. Take extra care to avoid smearing on the
surface of the facing.
Optional redesign of upper louver area
You may use other decorative materials to cover the
upper louver area. However, you must follow the follow-
ing criteria:
If any material is placed in front of the louvers (brick, tile,
etc.) the louvers must first be permanently removed.
The final open area over the louver must be at least 50%
of the area of the opening or 100 square inches. For
example see (Figure 25).
REMOTE VENTING
The gravity vent system can distribute air to an upper
level or a room next door without an extra blower. The
Page 17
DELTA
7”
B-vent starter
section
grill adaptor
Figure 27: Gravity vent kit (FDVD)
slot
no ducting
one gravity vent kit
central heat option
ducted from top
Figure 26: Remote venting options
grill
