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Regency
®
 P48-2 Zero Clearance Direct Vent Gas Fireplace
23
Diagram 7
Diagram 6
9)  Install wall thimble in the center of the 11"  
(279mm) square and attach with wood 
screws (Diagram 7).
Diagram 5
6)  The arrow on the vent cap should be 
pointing up. Insure that the 1-1/4"(32mm) 
clearances to combustible materials 
are maintained (Diagram 5). Install the 
termination cap.
Note:  If installing termination on a siding 
covered wall, a vinyl siding standoff 
or furring strips must be used to 
ensure that the termination is not 
recessed into the siding.
 
The four wood screws provided should 
be replaced with appropriate fasteners for 
stucco, brick, concrete, or other types of 
sidings.
7)  Before connecting the horizontal run of vent 
pipe to the vent termination, slide the Wall 
Thimble (Part # 1247) over the vent pipe.
8)  Slide the appliance and vent assembly 
towards the wall carefully inserting the 
vent pipe into the vent cap assembly. It is 
important that the vent pipe extends into the 
vent cap suffi cient distance so as to result 
in a minimum pipe overlap of 1-1/4 inches 
(32mm). Secure the connection between the 
vent pipe and the vent cap by attaching the 
two sheet metal strips extending from the 
vent cap assembly into the outer wall of the 
vent pipe. Use the two sheet metal screws 
provided to connect the strips to the pipe 
section. See Diagram 6.
INSTALLATION
UNIT INSTALLATION 
WITH HORIZONTAL 
TERMINATION
Install the vent system according to the 
manufacturer's instructions included with the 
components.
1)  Set the unit in its desired location. Check 
to determine if wall studs or roof rafters 
are in the way when the venting system is 
attached. If this is the case, you may want 
to adjust the location of the unit. Rough in 
the gas preferably on the right side of the 
unit and the electrical (junction block is on 
the left side) on the left.
2)  Direct Vent pipe and fi ttings are designed with 
special twist-lock connections to connect the 
venting system to the appliance fl ue outlet. A 
twist-lock appliance adaptor is an available 
option that must be used in conjunction with 
the Simpson Dura-Vent Direct Vent GS 
system. Install the adaptor after the unit is 
set in its desired location otherwise the unit 
will not fi t through the 
 
36-5/8" (930mm) high frame opening.
3)  Put a bead of silicone inside the outer 
section of the adapter and a bead of Stove 
Mate on the inner collar. Slip the adapter 
over the existing inner and outer fl ue collar 
and fasten to the outer collar only with the 
3 supplied screws (drilling pilot holes will 
make this easier). Level the fi replace and 
fasten it to the framing using nails or screws 
through the nailing strips.
4)  Assemble the desired combination of pipe 
and elbows to the appliance adaptor and 
twist-lock for a solid connection.
Note:
 a)    Twist-lock procedure: Four indentations, 
located on  the female ends of pipes and 
fi ttings, are designed to  slide straight 
onto the male ends of adjacent pipes 
and fi ttings, by orienting the four pipe 
indentations so they match and slide in 
to the four entry slots on the male ends. 
(Diagram 1) Push the pipe sections 
completely  together, then twist-lock 
one section clockwise approximately 
one-quarter turn, until the two sections 
are fully locked. The female locking lugs 
will not be visible from the outside, on 
the Black Pipe or fi ttings. They may be 
located by examining the inside of the 
female ends.   
Diagram 1
Note:   For best results and optimum 
performance with each approved 
v e n t i n g   s y s t e m ,   i t   i s   h i g h l y 
recommended to apply “Mill-Pac” 
sealant (supplied) to every inner 
pipe connection. Failure to do so 
may result in drafting or performance 
issues not covered under warranty. 
Silicone (red RTV) is optional.
 b)  Horizontal runs of vent must be 
supported every 3 feet (0.9meter). Wall 
straps are available for this purpose.
5)  Mark the wall for a 11" x 11" (279mm x 
279mm) square hole. The center of the 
square hole should line up with the center-
line of the horizontal pipe. Cut and frame the 
11 inch  (279mm) square hole in the exterior 
wall where the vent will be terminated. 
 
If the wall being penetrated is constructed 
of non-combustible material, i.e. masonry 
block or concrete, a 8" (203mm) diameter  
hole is acceptable.
Diagram 2
Note:
 a)
  The horizontal run of vent must be level, 
or have a 1/4 inch rise for every 1 foot 
of run towards the termination. Never 
allow the vent to run downward. This 
could cause high temperatures and may 
present the possibility of a fi re.
 
b)  The location of the horizontal vent 
termination on an exterior wall must meet 
all local and national building codes, and 
must not be blocked or obstructed.  For 
External Vent Terminal Locations, see 
diagram in "Exterior Vent Termination 
Locations" section.