DELTA2 Owner's Manual 18 RSF Woodburning Fireplaces
HEARTH EXTENSION
The area immediately in front of the fireplace must be protected by a non-combustible material such as brick, tile,
stone, or slate. Refer to Table 1 (G-H) for the depth and width the hearth protection should extend beyond the
front and both sides of the door opening (see Figure 1). There is no minimum thickness required for the hearth
extension.
BENEATH HEARTH EXTENSION
If the DELTA2 is installed on a non-combustible floor, the spark guard specified below is not required.
Install the spark guard provided (5" x 36" piece of sheet metal) halfway under the fireplace and halfway under the
hearth extension and centered on the door opening. The spark guard will extend 2½" beneath the fireplace. This
will make certain that sparks cannot lodge in this area and start a fire. If necessary, the provided spark guard can
be cut to the minimum width specified in Table 1 (I).
If you are preparing a raised installation, you will need
a custom made spark guard, either a "Z" shaped spark
guard or a right angle spark guard (see Figure 17).
The Z-shaped spark guard must be used if the height
between the bottom of the fireplace and the top of the
non-combustible flooring of the hearth extension is
less than or equal to 2 ½". The height of the Z-shaped
spark guard must equal the distance between the floor
and the base of the unit and go under the hearth
extension and the fireplace by at least 2½". If the unit
is installed higher than 2 ½" from the top of the
flooring, a right angle spark guard is necessary. The
sides of the right angle spark guard should be at least
2½" x 2½" and must be covered with non-combustible material. Any custom-made spark guard must have the
minimum width specified in Table 1 (I), and be installed centered on the door opening.
NOTE: Custom-made spark guards are not supplied.
MANTEL
Refer to Table 1 (J) for the maximum depth of the mantel and its installation height. Wood or other combustible
mantels must be placed as specified in Table 1 (K) and illustrated in Figure 1.
Masonry and other non-combustible mantels can be placed directly above the top of the fireplace facing or higher.
If the noncombustible mantel is located between the top of the fireplace facing and the specified height for a
combustible mantel, then the wall portion between the top of the fireplace facing and the mantel must be covered
in non-combustible material. If the non-combustible mantel is located at the same height allowed for a
combustible mantel, or higher, then no special wall covering is required below the mantel.
MANDATORY OPTIONS WITH THE CLEAN FACE
When installing a Clean Face (FO-F) on your DELTA2, you MUST install the intake duct (part of FO-F) to provide
sufficient air to the unit along with two Gravity Vent Kits (FO-V, sold separately) to provide an evacuation path for
the heat. Neglecting to install either one of these will result in overheating of the unit and may put your safety at
risk. Refer to each option's installation instructions for particular details.
Use only genuine RSF parts. The use of any substitutes will decertify the system and may put your safety at risk.
REFRACTORY BRICK INSTALLATION
The refractory bricks for the DELTA2 fireplace are placed in the fireplace at the factory. If, for any reason, they
should need to be replaced the following order should be observed (see Figure 18). To remove any of the
refractory bricks, just follow the installation procedure in the reverse sequence. Refer to Figure 18 to adequately
identify which refractory brick is the right and which is the left at each step of the installation.
1. First, install both bottom refractory bricks (right 11.5.D and left 11.6.D) as shown in Figure 18.
2. Then install both back refractory bricks (right 11.1.D and left 11.2.D).
RSF
Fireplace
Non-
Combustible
Flooring
Right Angle
Spark Guard
(not provided)
More than 2 1/2"
Non-
Combustible
Flooring
Z-Shaped Spark
Guard (not
provided)
2 1/2" or less
Figure 17 Special Custom-made Spark Guard
