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Regency
®
 P42-4 Zero Clearance Direct Vent Gas Fireplace
9
Position of Top Facing Support
for material depth of 3/4” to 1-1/2"
Top Facing
Support
TOP ASSEMBLY & 
NAILING STRIPS
The Top Facing Support and Side Nailing Strips  
must be correctly positioned and attached before 
the unit is slipped into position. 
1)  The top standoffs are shipped installed.
2)  The Top Facing Support and the 2 Side 
Nailing Strips can be installed at different 
depths depending on the width of your facing.  
Match the depths of the top facing support 
and the side nailing strips.
 
 
a)  Mount Top Facing Support using the 3 
supplied screws into the 3 pre-punched 
screw holes on the top front of the unit. 
See Diagrams 2 & 3 for the proper 
position of the Top Facing Support for  
the various material depths.
Diagram 1
Diagram 2
Diagram 3
Diagram 4
INSTALLATION
5)  The unit does not have to be completely 
enclosed in a chase. The clearance on top 
of the unit from the top standoffs is 0" so 
combustible building materials can be laid 
directly on top of the standoffs. You must 
maintain these clearances from the vent 
to combustible materials: Flex Termination 
clearance 1-1/2" (38mm), Simpson Dura-Vent 
clearance or (1-1/4" (32mm). Combustible 
materials can be laid against the side and 
back standoffs and the fi replace base.
 b)  Mount the Side Nailing Strip using the 3 
supplied screws into the 3 screw holes 
or slots (diagram 4) on the side of the 
unit and repeat for the other side. Use 
the hole for a 1/2" (13mm) thick facing 
material and the slot for a range of 
thickness from 3/4" to 1-1/2" (25mm to 
38mm). 
VENTING 
INTRODUCTION
The  P42  uses  the  "balanced  fl ue"  technology 
Co-Axial system. The inner liner vents products 
of combustion to the outside while the outer 
liner draws outside combustion air into the 
combustion chamber thereby eliminating the 
need to use heated room air for combustion and 
losing warm room air up the chimney.
Note: These flue pipes must not be 
connected to any other appliance.
The gas appliance and vent system must be 
vented directly to the outside of the building, 
and never be attached to a chimney serving a 
separate solid fuel or gas burning appliance. 
Each direct vent gas appliance must use it's own 
separate vent system. Common vent systems 
are prohibited.
VENT RESTRICTOR
A vent restrictor may be required. Check 
the diagrams in the "Rigid Pipe Venting 
Arrangements" section to determine if the #6 
restrictor is needed for your vent confi guration. 
If required, attach the 2 piece #6 restrictor 
using 4 screws per piece to the inside top of 
the fi rebox.
Note:  43" (1092mm) is the minimum height 
for fl ex termination and Rigid Pipe  
terminations.
Diagram 1
FRAMING AND 
FINISHING
1)  Determine the total thickness of facing 
material (ie. drywall plus ceramic tiles) to 
allow the fi nished surface to be fl ush with 
the front of the unit. Total facing thickness 
can vary from 1/2" (13mm) to 1-1/4" (32mm) 
thick.
2)  Frame in the enclosure for the unit with 
framing material. The framed opening for 
the assembled kit is 36-5/8" high x 40-1/4" 
wide x 19" deep (930mm  H x 1022mm W 
x 483mm D). See Diagram 1.
3)  For exterior walls, insulate the enclosure to 
the same degree as the rest of the house, 
apply vapour barrier and drywall, as per 
local installation codes. (Do not insulate 
the fi replace itself.)
4)  The top louvers must not be closer than 
36" (914mm) to the ceiling.
The  HeatWave Duct Kit has different 
clearance and framing requirements, 
check the HeatWave manual for details.