Isokern IBV-36 Owner's manual

ISOKERN B-VENT FIREPLACE
A PRODUCT OF EARTHCORE INDUSTRIES, LLC.
INSTALLATION, OPERATION, MAINTENANCE and
OWNER’S MANUAL
ISOKERN MODELS IBV-36 and IBV-46
IMPORTANT: This manual contains assembly rules, installation steps and guidelines, and use and maintenance
instructions for Isokern B-VENT gas appliances (IBV). This manual must become the property of and be reviewed
by all current and future users of this product. It is the responsibility of the distributor, general contractor and the
installer of this product that the instructions in this manual are followed exactly and, further that the allowed gas
log appliance used in this product be installed in strict accordance with the gas log manufacturer’s listing and
explicit installation and operation instructions.
This Listed Top Vented Gas Log Enclosure is designed for use with
Decorative Natural Gas or Propane (LP) Gas Appliances, only.
DO NOT BUILD A WOOD FIRE
WARNING: If the information in this
manual is not followed exactly, a re or
explosion may result causing property
damage, personal injury or loss of life.
- NOT FOR USE WITH SOLID FUEL.
- The ue damper must be in the full open
position when burning the gas logs.
- Do not store or use gasoline or any other ammable
vapors or liquids in the vicinity of this or any other
appliance.
-This appliance complies with National Safety
and is tested and listed to ANSI Z21.50b - 2009 as
vented gas replaces.
- Installation and service must be performed
by a locally certied gas service agent, licensed
plumber or the gas supplier.
-Installation must conform to local codes. Check
local codes prior to installation.
In the absence of local codes, installation must
conform with current National Fuel Gas Code,
ANSI Z223.1.
INSTALLER: Leave this manual with the
appliance.
CONSUMER: Retain this manual for future
reference.
- WHAT TO DO IF YOU SMELL GAS:
* Do not try to light any appliance.
* Do not touch any electrical switch.
* Do not use any phone in your building.
* Immediately call your gas supplier
from a neighbor’s phone. Follow the gas
supplier’sinstructions.
* If you cannot reach your gas supplier,
call the re department.
PFS Report No. 09-79
SAP No. 506022-03
Issued: March, 2014
Revision: 004
© 2009 ECI
THIS MANUAL CAN ONLY BE REPRODUCED IN ITS ENTIRETY
USA: ANSI Z21.50b-2009b-2009
Canadian: CSA 2.22b - 2009

Table of Contents
2
General Information ....................................................................................................................................... 3
Safety Information ........................................................................................................................................... 4-5
Assembled Firebox and Smoke Dome Dimensions........................................................................................... 6
Component List and Dimensions...................................................................................................................... 7
Required Component List .................................................................................................................................. 8
Required Clearance to Combustibles ................................................................................................................. 9
Combustible Floor System Loading ..................................................................................................................10
IBV Rough Framing Dimension & Corner Location Layout ............................................................................11
IBV Assembly Instructions ................................................................................................................................12-18
Raised and Flush Hearth ....................................................................................................................................13
Access Modications .........................................................................................................................................16
Fire Brick Installation ........................................................................................................................................17
Metal Canopy Installation ................................................................................................................................. 18
Venting Installation ............................................................................................................................................19-21
Anchor Plate Installation ................................................................................................................................... 19
Flush Wall Finish Detail .....................................................................................................................................22
Required Clearances (when sheathing protrudes beyond front of rebox) ........................................................23
Flush Wall Fire Brick Finish Detail ....................................................................................................................24
Finish Facing Detail ............................................................................................................................................25
Interior Full Masonry Veneer Finished Fireplace Fronts ....................................................................................26
Interior Full Masonry Veneer Finished Fireplace Fronts Details ........................................................................27
Noncombustible Finished Facing Requirements & Clearance to Combustible Trim .........................................28
IBV Pilot Assembly Wiring Diagram .................................................................................................................29
ISOFLAMES Gas Log System Owners Manual ................................................................................................30-38
General Information ............................................................................................................................................31
Safety Instruction Prior to Installation ................................................................................................................31-32
Gas Log Burner Installation ................................................................................................................................33-34
ISOFLAMES Gas Log Assembly Instructions....................................................................................................35-36
Safety Instruction Before Lighting & Lighting Instructions ...............................................................................37-38
Troubleshooting & Maintenance .........................................................................................................................39
Customer Service & Warranty .............................................................................................................................40
Warranty Card ......................................................................................................................................................41
Optional Iso-Flame Wall Switch Instructions...................................................................................................... 42
Notes ................................................................................................................................................................... 43
Warranty
Note: Illustrations shown in this manual are not to scale and are intended to show “typical” installations. Nominal dimensions are
given for design and framing reference only since actual installations may vary due to job specic design preferences. However,
always maintain minimum clearances to combustible materials and do not violate any specic installation requirements.

3
General Information
IBV Models IBV-36 and IBV-46 are tested and listed by
PFS Corp., USA Report No. 09-79 to ANSI Z21.50b-2009b-2009
and Canadian Standard CSA 2.22b - 2009. The IBV models are
top-vented, gas only replaces that are listed for use only with
the ISOFLAMES Gas Log appliance listed in this installation
manual. These gas appliances come with a gas control valve that
includes an automatic shut-off switch. The gas valve is available
in a millivolt remote control pilot assembly.
The exhaust ue gases are to be vented through the top
of the unit with listed B-Vent piping. A ten inch (10”) diameter,
double wall B-Venting system and a listed vent cap are not
supplied but are required for proper operation of all IBV Models,
36 and 46. See venting instructions on pages 19-21.
WARNING: This gas appliance must not be connected to a
chimney ue servicing a solid fuel burning appliance.
Intended Use Statement:
The IBV is intended to burn propane (LP) gas or natural gas
(NG), only. This appliance is not intended to be used as a primary
source of heat.
The IBV and its approved components are safe when installed
according to this installation manual and when operated as
recommended by the manufacturer. Unless you use Earthcore
Industries, LLC approved components tested for this appliance,
you may cause a re hazard or serious injury.
Before you begin the installation of this appliance, read these
instructions completely.
Earthcore Industries, LLC disclaims any responsibility for the
following actions:
1. Modication of the appliance or any of its components.
2. Use of any component part not approved by Earthcore
Industries, LLC in combination with this appliance.
3. Installation or operation in a manner other than instructed in
this manual.
4. Burning of anything other than the listed gas log unit and the
type of gas approved for use in this gas appliance.
Notes:
The most important areas of concern with the installation of the
top venting IBV are clearance to combustible materials, proper
assembly of component parts, load carrying capacity of underlying
oor system, height of chimney system, hearth extensions and
the techniques employed in applying nishing materials to the
wall surrounding the IBV.
Each of these topics will be covered in detail throughout
this manual. Special attention must be given to each topic as the
installation progresses.
The installation of the IBV must conform with local
codes or, in the absence of local codes, with the current National
Fuel Gas Code, ANSI-Z223.1/NFPA 54 or the current Natural
Gas and Propane Installation Code, CSA B149.1.

4
Safety Information
WARNING: This product contains or generates chemicals
known to the state of California to cause cancer or birth defects
or other reproductive harm.
Important: Read this owner’s manual carefully and completely
before trying to assemble, operate or service this replace.
Improper use of this replace can cause serious injury or death
from re, burns, explosions and carbon monoxide poisoning.
CAUTION: Carbon monoxide poisoning may lead to death!
This replace is a vented product and will not produce any
gas leakage into your home if properly installed by a qualied
service person. If this unit is not properly installed by a qualied
service person, gas leakage may occur.
Propane (LP) gas and natural gas (NG) are both colorless and
odorless gases. An odor-making agent is added to each of these
gases to help you detect a gas leak. However, the odor added
to these gases can fade and gas may be present even though no
odor exists.
Carbon Monoxide Poisoning: Early signs of carbon monoxide
poisoning resemble u symptoms, including headaches,
dizziness or nausea. If you have these signs the replace may
not have been installed properly, get fresh air at once! Have the
replace inspected and serviced by a qualied service person
or your gas supplier. Some people are more affected by carbon
monoxide than others. These include pregnant women, people
with heart or lung diseases or anemia, people at high altitude
or under the inuence of alcohol. Earthcore Industries, LLC
strongly recommends the use of a carbon monoxide detector/
alarm device wherever gas red appliances are in use.
All parties either involved in or associated with the installation,
service and use of this replace must read this entire manual.
Keep this manual for reference and as a guide book to safe
operation of this replace.
WARNING: This unit is not for use with solid fuel.
1. Always check local building codes governing replaces and
replace installations. The IBV installation must comply with
all local, regional, state and national codes and regulations.
2. The B-Vent chimney system is for top venting only and must
vent vertically through the roof of the building.
3. The IBV unit is listed for use with the ISOFLAMES decorative
gas log appliance listed in this manual only.
4. This appliance is only for use with the type of gas indicated
on the rating plate. This appliance is not convertible for use with
other gases.
5. For propane (LP) use do not place propane supply tank(s)
inside any structure. Locate propane supply tank(s) outdoors.
To prevent performance problems, do not use propane fuel tank
of less than 100 lbs. capacity.
6. Do not install the IBV in a mobile home or recreational
vehicle.
Note: Never install where curtains, furniture or other ammable
objects are less than forty-eight inches (48”) from the front of
the replace opening.
7. Do not install the IBV in high trafc areas or in windy or
drafty areas.
8. This replace reaches high temperature. Keep children
and adults away from hot surfaces to avoid burns or clothing
ignition. Fireplace will remain hot for a time after shutdown.
Allow surfaces to cool before touching.
9. Turn the IBV gas logs off and allow to cool before servicing.
Always shut off any electricity and gas to the IBV while working
on it. Only a qualied service person should install, service or
repair this replace. Have replace inspected annually by a
qualied service person.
10. It is imperative that the unit’s control areas, burners and
circulation air passages be kept clean. More frequent cleaning
may be needed due to excessive lint and dust from carpeting,
bedding material, pet hair, etc. Turn off gas valve and pilot light
before cleaning replace.
11. Venting system should be inspected annually by a qualied
service person. If needed have venting system cleaned or
repaired.
12. Keep all combustible material, gasoline and other ammable
liquids at a safe distance from the replace. Do not use the
replace where these items are used or stored. Decorations,
clothing and other such combustible items should not be placed
on the replace.
13. Do not use the IBV to cook food or burn paper or other
objects.
14. Do not use any solid fuels - wood, coal, paper, cardboard,
etc. - in this replace. Use only the gas type listed on the
replace’s gas log label.
15. Do not in any way obstruct the ow of combustion and
ventilation air. Provide adequate clearances around air openings
into the combustion chamber as well as adequate accessibility
clearances for servicing and proper operation.
16. If the replace is installed directly on carpeting, vinyl tile
or any combustible material other than wood ooring or wood
sub-ooring, the appliance shall be installed on a metal sheet,
cementitous board or wood panel extending the full width and
depth of the unit, including hearth extensions.
WARNING:
This replace has not been tested for use with glass
doors. To reduce the risk of re or injury, do not install glass
doors.
Some jursdictions require the use of glass doors.
If glass doors are used, operate replace with doors in the
fully open position.

5
Safety Information
17. Wherever insulation is used, the replace must not be
placed directly against it. Keep all insulation and vapor barriers
a minimum of three inches (3”) away from all IBV and B-Vent
chimney components.
18. Insulation or vapor barriers, if used, must rst be covered
with gypsum board, plywood, particle board or other sheathing
material to assure that insulation and vapor barriers remain in
place. Do not pack or ll required air spaces with insulation or
other material. No material is allowed in these spaces.
19. Never install an IBV component, chimney component or
accessory that has visible or suspected physical damage as
a result of handling or transportation. These items should be
inspected by a qualied representative to ensure safe condition.
When in doubt, consult your local supplier.
20. Do not alter or modify the Innovative Hearth Products
(IHP) manufactured B-Vent metal ue or ue components
under any circumstances. Modication or alteration of the
chimney components may void manufacturer’s warranty,
listings and approvals.
21. Do not use a replace blower insert, heat exchanger or any
other product not specied by the manufacturer herein for use
with this replace.
22. Do not use the IBV appliance if any part has been under
water. Immediately call a qualied service technician to inspect
the appliance and to replace any part of the control system and
any gas control which has been under water.
23. The IBV is not intended to heat an entire home or to be
used as a heat source.
24. Negative pressures may result in poor ame appearance,
sooting, damage to property and possible severe personal
injury. To ensure that an adequate supply of combustion air is
accessible consult with a local HVAC engineer.
25. Children and adults should be alerted to the hazards of
high surface temperature and should stay away from this
appliance to avoid burns or clothing ignition.
26. Young children should be carefully supervised when
they are in the same room as the appliance.
27. Clothing or ammable material should not be placed on
or near the appliance.
28. Installation and repair should be done by a qualied service
person. The appliance should be inspected at least annually by
a professional service person. More frequent cleaning may be
required due to excessive lint from carpeting, bedding material,
etc. It is imperative that control compartments, burners and
circulating air passageways of the appliance be kept clean.

6
Assembled Firebox & Smoke Dome Dimensions
Earthcore Industries, LLC. reserves the right to make changes at any time, without notice, in design, materials and specications
and also to discontinue styles and product. Phone [phone] or visit: www.earthcore.co
Side View Front View Plan View
A
E
F
E
G
H
C
D
B
ModelABC DEFGHIMinimum Framing Weight
36” 43” 25¼” 71 1/4” 31 1/2” 36 1/8” 27 1/4” 21½” 20¼” 5“ 43”W x 71 1/4” H x 26 3/4”D 1500 lbs.
46” 53” 25¼31 1/2” 47 1/8” 37 1/4” 32” 20¼” 5“ 53”W x 71 1/4” H x 26 31/4” D1700 lbs.
I
36” 43” 25¼” 81 3/4” *42” 21½” 20¼” 5“ 43”W x 81 3/4”H x 26 3/4” D 1650 lbs.
46”53” 25¼32” 20¼” 5“ 53”W x 81 3/4”H x 26 3/4” D 1850 lbs.
*42”
*To achieve height dimension“D” in table above, a 9’ minimum flue height with 10” I.D. B-Vent is required
36”43” 25¼” 92 1/4”” *52 1/2” 21½” 20¼” 5“ 43”W x 92 1/4“ H x 26 3/4”D 1800 lbs.
46”53” 25¼ 92 1/4” 32” 20¼” 5“ 53”W x 92 1/4” H x 26 3/4” D 2000 lbs.
*52 1/2”
81 3/4”
*To achieve height dimension“D” in table above, a 12’ minimum flue height with 10” I.D. B-Vent is required
*To achieve height dimension“D” in table above, a 100“ (8.3’) minimum flue height with 10” I.D. B-Vent is required
36 1/8”
47 1/8”
47 1/8”
36 1/8”
27 1/4”
27 1/4”
37 1/4”
37 1/4”
71 1/4”

7
Component List & Dimensions
Part
No.:
21
23
Fireplace
Size:
36”W
46”W
Quantity:
1
1
Part
No.:
12
Fireplace
Size:
36”W
Quantity:
2
Part
No.:
11
11
Fireplace
Size:
36”W
46”W
Quantity:
2
2
Part
No.:
13
Fireplace
Size:
46”W
Quantity:
2
Part
No.:
34
34
Fireplace
Size:
36”W
46”W
Quantity:
4
4
TOP - BIG
TOP - SMALL
BASE PLATE
Model A
36” 43”
46” 53”
TOP - MEDIUM
TOP - SLOPING
Part
No.:
20
20
Fireplace
Size:
36”W
46”W
Quantity:
6
6
Part
No.:
25
31
Fireplace
Size:
36”W
46”W
Quantity:
3
3
SIDE WALL
BACK WALLS
TOP PLATE SMALL
TOP PLATE LARGE
Model
25, 31 - stacked two (3) high
B
36” 26 ¾”
46” 37 ½”
33 ½”
25 ¼”
10 5/8”
25 ¼”
10 ¾”
25 ¼”
10 ¾”
22 ½”
4
”
4”
Part
No.:
36
Fireplace
Size:
36”W
Quantity:
1
Part
No.:
37
Fireplace
Size:
46”W
Quantity:.
1
B
10 5/8”
5”
32 1/2” 16”
4”
A
25 1/4”
3”
42. 3/4” 16”
4”
4”
52. 3/4”
16”
16”
25 1/4”
2 3/4”

8
Required Component List
In addition to the standard IBV modular masonry rebox and smoke dome assembly components the IBV requires particular
components necessary to complete the installation and meet the ANSI Z-21.50 listing. The two boxes of special IBV components
include the following:
IBV Box 1 of 2:
1. One (1) B-Vent Installation, Operation, Maintenance and Owner’s Manual
2. One (1) metal canopy/wiring raceway with 4 mounting screws with high temperature limit switch and damper macro switch/
lever assembly pre-mounted. Warning stickers attached.
3. Two (2) high temperature wires, twelve feet long (12’)
IBV Box 2 of 2:
1. One (1) 10” anchor plate / down draft diverter / B-Vent starter collar/in-line damper combination unit with 4 mounting
screws
3. One (1) C-Clamp warning label
2. One (1) ceramic ber blanket - 24” x 24” x 1/2 inch thick

9
Required Clearance to Combustibles
Important: “Combustibles” are dened as “normal construction materials” and considered to be: wood framing materials, particle
board, mill board, plywood paneling, plywood subooring and wood ooring.
The IBV is listed for installation with “clearance to combustibles” (shown below) as follows:
A: Zero inch (0”) clearance to the combustible oor; (Isokern Base Plate must be used)
B: Zero inch (0”) clearance at the Isokern rebox sides and front and smoke dome sides and front;
C: One and one half inches (1-1/2”) clearance at the Isokern rebox back wall and smoke dome back wall;
D: One inch (1”) minimum air space to combustibles at all B-Vent double wall chimney components’ outer layer.
(Contact pipe manufacturer for specic clearance information)
CAUTION: Maintain three inches (3”) clearance to insulation and vapor barriers from all rebox, smoke dome and B-Vent ue
components’ outer layer.
Notes:
1. The IBV is designed, tested and approved for installation directly on a combustible oor system per the installation specications
given in this manual.
2. All IBV installations will result in the minimum nished re brick oor of the rebox being at least four and one half inches
(4-1/2”) above the combustible oor system. For ush hearth installations, consult your local representative.
3. The combustible oor in front of the replace must be covered with a noncombustible hearth extension material set tight against
the replace front and extending at least twenty inches (20”) out from the nished front of the replace and at least twelve inches
(12”) beyond the nished sides of the replace opening (See page 28).
WARNING: Combustible objects placed in front of the replace must be kept to a minimum of forty eight inches (48”) clearance
to the replace opening.
B
A
B
B
D
DD
C
Combustible
Floor System
(non-insulation)
Hearth Extension
(non-combustible)

10
Combustible Floor System Loading
Important:
Floor framing for IBV installation will need to
be designed and built to accept substantial dead loads spread
over a relative small oor area. (Figure 1)
The following weights and sizes can be used to
calculate loading. It is the contractor’s responsibility to provide
adequate oor system load capacity.
IBV Weights and Load Calculations:
Total dead load amounts include (but are not necessarily limited
to) the following items and their corresponding weight estimates
as listed below:
1. Isokern unit model weights:
a. IBV-46: 1400 lb
b. IBV-36: 1200 lb
2. Approximate weight of log set: 100 lb.
3. Fire brick and mortar: 350 lb.
4. Facing material: per general contractor
5. B-Vent metal ue: per manufacturer
The oor area for each model is as follows:
IBV-46 @ 53” x 25.25” = 9.30 sq. ft.
IBV-36 @ 43” x 25.25” = 7.54 sq. ft.
Notes:
1. Earthcore is not responsible for structural oor support
details for this replace system. Unless otherwise noted all
oor framing drawings in this manual are merely illustrations
to indicate the presence of an underlying oor system.
2. Consult your local structural engineer for proper oor system
design, sizing and specications.
Combustible
Floor System
(non-insulated)
Hearth Extension
(non-combustible)
Figure 1

11
IBV Rough Framing Dimensions
Rough Framing Dimensions
Model A B C
IBV 36 43” 72”,83”,93” 26 3/4”
IBV 46 53” 72”,83”,93” 26 3/4”
Notes:
1. “Raised hearth” requires additional rough opening
height at “B” equal to the height of the raised hearth
detail.
2. Rough framing dimension for depth “C” allows for
one and one-half inch (1-1/2”) clearance at the back of
the IBV.
3. Keep all insulation and vapor barriers three inches
(3”) away from all IBV surfaces.
4. Opening height of 83” requires minimum 9’ ue; 93”
height requires minimum 12’ ue.
IBV Corner Location Layout
The following chart of plan dimensions is intended to aid
in the positioning of an IBV in a corner condition.
Model A B C D
IBV 36 43” 49” 32” 70”
IBV 46 53” 59” 39” 77”
B
Framed
Opening
A
Framed
Opening
C

12
IBV Assembly Instructions
General Assembly Instructions:
Earthcore Mortar (a thin-set type masonry adhesive) is
used to glue all IBV masonry components together during eld
assembly of the unit. The mortar is supplied dry, in either 15
pound or 50 pound pails.
Earthcore Mortar is mixed with clean water to a
smooth, workable texture (without lumps or dry pockets) of a
“toothpaste” consistency. This mixture is suitable for application
onto IBV components by using a masonry grout bag such as the
one supplied with the unit.
Attention should be paid that the mortar mixture is not
too thin or runny, as this will not allow the mortar to reach its
maximum bonding strength.
Earthcore Mortar is squeezed from a grout bag onto
the contact surfaces of the IBV components as they are tted
together. (Figure 2)
It is important that a one-half inch (1/2”) bead of mortar
on all the components’ contact surfaces is applied at about one-
half inch (1/2”) in from all edges of the contact surface of the
component.
When setting a component onto the mortared contact
surface of the preceding component, some mortar should squeeze
out along the face of the entire joint as a sign of complete and
proper sealing of the joint.
On broader contact surfaces it is advisable to apply
several additional one-half inch (1/2”) beads of the Earthcore
Mortar to the area to assure proper sealing of the joint.
Properly mortared rebox and smoke dome requires
approximately 25 pounds (dry measure) of Earthcore Mortar.
Broken Components: Components broken into two or three
pieces can be glued together along the break line with Earthcore
Mortar as the component is set into place. Components broken
into multiple small pieces should be discarded and replaced.
Leveling and Aligning Components: Be sure to assemble all
IBV components level and ush with adjoining components.
Leveling and alignment adjustments are made by the
use of small plastic shims (supplied with the unit). The shims can
be inserted under a component to level and align it with adjacent
IBV components (Figure 3). Be sure to add mortar to all gaps
resulting from shim insertion.
Notes:
1. Do not mix Earthcore Mortar with spirits or anti-freeze
agents.
2. The maximum recommended mortar joint thickness at IBV
components is one quarter inch (1/4”).
3. Earthcore Mortar can be troweled over the face of a joint where
it has squeezed out while setting components. It is not intended
that the exposed faces of IBV components be completely covered
with the mortar.
Earthcore Mortar
Shim if required
to acheive
correct height
Figure 2
Figure 3

Raised hearth
for wood or
concrete installs
Flush Hearth
on Concrete
Foundations Only
Earthcore
Mortar
13
IBV Assembly Instructions (cont.)
Assembly Steps for IBV rebox and smoke dome:
Step 1:The IBV base plate can be set directly on a combustible
oor system. Set the base plate level in a bed of Earthcore Mortar
so that the base plate is in full contact with the underlying oor
system (Figure 4). Do not set the IBV base plate in span.
Raised and Flush Hearth Application:
For a “ush hearth” the IBV must be built upon a
concrete (noncombustible) support slab that has no wood
underpinnings. (Figure 5) For a “ush hearth” application
the IBV three inch (3”) thick base plate is omitted from the
assembly. The rebrick will then be mortared on the concrete
slab and the noncombustible hearth material will butt tight up
against it.
For a “raised hearth” (oor of the replace elevated
above the room’s oor) the IBV base plate can be set on a
structurally sound built up platform that is built to the desired
nished raised hearth height.
When calculating raised hearth height be sure to allow
for the three inch (3”) thick base plate plus the one and one-half
inch (1-1/2”) thick re brick oor in addition to the height of
the eld constructed raised platform. (Figure 6)
WARNING:
“Flush hearth” installations are possible only where the IBV
support is a concrete slab without any wood underpinning
as the base plate is omitted. Never place an IBV on a
combustible oor without the base plate.
Figure 4
Figure 5
Figure 6

Drill Hole
Earthcore
Mortar
Earthcore Mortar
First Course
Back Wall
Top Course
Back Wall
Earthcore Mortar
High Temperature
Wire ( 2 pc. / 12’ long)
High Temperature
Wire (2 pc. / 12’ long)
14
IBV Assembly Instructions (cont.)
Step 2: Set the rst course of the rebox back wall and side
walls into place on the base plate. (Figure 7)
It may be convenient to temporarily dry set the rst
course of side wall and back wall into place on the IBV base
plate and then to trace their position on the base plate with a
pencil.
Remove the dry set pieces and apply Earthcore Mortar
to the areas traced on the base plate where the side walls
and back wall are to sit. By doing this, the rst layer of wall
components can be set directly into mortar already applied to
the proper areas on the base plate.
Be sure to put Earthcore Mortar on the contact
surfaces of the vertical joints where the side wall and back wall
components connect. (Figure 8)
Step 3: It is required that the two supplied high temperature
wires be routed from the inside of the IBV as follows:
Once the lowest, left hand side wall rebox component
is set in place (left, when facing the replace) drill a 1/4” - 3/8”
dia. hole in the inner face of this side wall located four to six
inches (4” - 6”) out from the back wall of the IBV and at three
to four inches (3” - 4”) above the IBV base plate. (Figure 9)
This drill hole must intersect the hollow core
of the IBV rebox side wall.
Feed the two lengths of high temperature wire from
the inside of the IBV rebox through the drill hole and into
hollow space of the rebox side wall. Bring the two lengths
of wire up and out through the top of the side wall component
(Figure 9).
Step 4: Continue assembly of the second and third courses of
the rebox side wall and back wall. Apply Earthcore Mortar
to the top of each layer of wall components, then set the next
course above into place.
Be sure to apply mortar to all vertical joints of the side
wall to back wall connection when setting each component to
its mate. (Figure 9)
Look for some Earthcore Mortar to squeeze out along
the joints of all component contact surfaces as a sign that the
joint is thoroughly sealed with mortar.
Continue to feed the two high temperature wires up
through the hollow core of the left hand sidewall stack.
Be sure to leave approximately four feet (4’) of each of
the two high temperature wires out of the top of the left hand side
wall of the rebox for later connection to the high temperature
limit switch and also four feet (4’) of each wire loose inside the
rebox for later connection to the pilot assembly. (See wiring
diagram, page 29.)
Note:
1. High Temperature Wire Specications: Supplied by others.
Figure 7
Figure 8
Figure 9

15
IBV Assembly Instructions (cont.)
Step 5: Once all the rebox wall components are set check the
top surface of the rebox for level.
Step 6: Begin the smoke dome assembly by setting the rear
bottom smoke dome component on top of the rebox back
wall assembly in a bed of Earthcore Mortar. The smoke dome
component should sit ush with the back side of the rebox
assembly. (Figure 10)
Step 7: Set the front bottom smoke dome component across the
rebox opening so that the smoke dome piece spans the rebox
opening and is ush with the front of the rebox.
Step 8: Position the smoke dome’s sloping sidewalls at each
end of the bottom smoke dome components (Figure 11).
The sloping sidewalls t in between the front and rear
smoke dome components and also t into the haunches at the
ends of the front and rear smoke dome components.
The smoke dome sloping sidewalls have a beveled
bottom edge so that they will sit tight onto the at top of the
rebox side walls.
Step 9: Set the upper course of front and rear smoke dome
components directly on top of and aligned with the bottom front
and bottom rear smoke dome components that are already in
place.
Set the two upper smoke dome sloping sidewalls into
position, one at each end of the upper front and rear smoke
dome components. (Figure 12)
Step 10: Ensure that all component contact surfaces have been
properly sealed with Earthcore Mortar.
Check smoke dome front and back walls to see that they
are plumb, level and in alignment with adjoining components.
Check alignment of the smoke dome sloping sidewall
components to see that they are ush with one another and
create smooth and uniform smoke dome Sidewalls for the total
height of the smoke dome.
Step 11: Set the smoke dome top plate into position on top of
the smoke dome wall assembly, with the ue hole closer to the
rear. (Figure 12)
Be sure to set the smoke dome top plate ush with the
front, back and sides of the smoke dome assembly.
High Temperature
Wire (2 pc. / 12’ long)
Figure 10
Figure 11
Figure 12

Firebrick
side
Gas or electric
line
NOTE: Fill any gaps around
line with Earthcore Mortar
Flex duct to fireplace
firebox (all parts non-combustible)
Exterior wall
Exterior air vent
with dress plate
Supply air ventilation
(if required by code)
T
ypical placement of
gas or electric line
(see detail below)
NOTE: Gas lines and combustion
air ventilation placement can be reversed.
This page used for illustration of systems
only.
16
Access Modication:
1. Gas Line Feed: These provisions for installation of a gas pipe is only
for connection to the included ISOFLAMES decorative gas log set. The
ISOFLAMES decorative gas log set incorporates an automatic shutoff
device and complies with the Standard for Decorative Gas Appliances
for Installation in Vented Fireplaces, ANSI Z21.60. The ISOFLAMES
decorative gas log set should be installed in accordance with the
ISOFLAMES Gas Log installation manual (pages 30 through 37) and
per the National Fuel Gas Code, ANSI Z223.1.
The gas line for the ISOFLAMES gas log set used in the IBV
rebox should be routed through the left side wall of the rebox (left,
when facing the unit) by drilling an appropriately sized hole using a
masonry drill bit (Figure 13).
CAUTION: Avoid the high temperature wire when drilling gas line
hole.
Notes:
1. Gas Line and Electric Line must be fed through separate access
holes.
2. Combustion Air Inlet: Combustion air inlet kits though not required
for IBV may help improve replace operation. (Figure 14 & 15). Check
local codes for combustion air requirements.
The access door is tted into the nished re brick lining at
the interior of the IBV rebox. The twelve inch (12”) long sleeve can
be introduced into the rebox right hand side wall by core drilling an
appropriately sized hole through the right-hand side wall keeping the
hole two inches (2”) above the rough oor of the rebox. (Figure 13)
The hole size should allow for a one quarter inch (1/4”) mortar joint
around the air access sleeve. The sleeve passes through the rebox wall
and must be connected to metal pipe - either exible or rigid - that leads
to the source for outside combustion air, maximum length sixty feet
(60’). Maintain clearance of at least two inch (2”) to air kit sleeve as it
exits the outer surface of the IBV side wall.
All access holes must be grouted with mortar - after line or
conduit feed - to seal any gaps or cracks around line feed conduits (Figure
15).
WARNING: Do not use combustible duct material. Avoid installing
a combustion air inlet where the opening could be blocked by snow,
bushes or other obstacles. Air inlet must terminate a minimum of three
feet below the chimney cap level. Air inlet ducts shall not terminate in
attic spaces.
IBV Assembly Instructions (cont.)
Figure 13
Figure 14
Figure 15

17
IBV Assembly Instructions (cont.)
Fire Brick Installation:
The manufacturer requires that the replace reboxes be lined
with a minimum one and one-eighth (1-1/8”) thick re brick.
Thicker re brick may be used as an option. The pattern for the
re brick lining is an owner option. Standard N or S type brick
mortar is suitable mortar for the replace.
Fire brick mortar needs to be suitable to both adhere
the re brick to the inside of the rebox and to create the
nished face joints of the brick work. Based on a history of
eld applications and experience, a suitable mortar would be as
follows:
Mix:
* 1 bucket masonry mortar (S or N type)
* 5 lbs Earthcore mortar
* Six parts sand (1 1/2 bucket)
* One part Fire Clay (optional)
* Water to a sticky, toothpaste consistancy
These instructions may vary because of different
climates and conditions. The use of good masonry practices for
your area should also be considered. It takes about 25 lbs. of
mortar mix (dry measure) to re brick line a replace.
All required through-wall accesses (gas and electrical
line feeds and combustion air supply access holes) should be
drilled before the required re brick lining is installed.
Face joints of one quarter inch (1/4”) to three-eights
inch (3/8”) give a good appearance to the nished brickwork.
However, larger face joint dimensions are also acceptable.
Step 1. Wet mop the inside of the IBV with a damp sponge
to remove dust and loose particles from the interior before
installing re brick.
Note: It is a good practice to dip each brick in water before
installing.
Step 2. Start the re brick at the front edge of the oor of the
Isokern rebox, proceeding inward toward the back.
Step 3: Apply C-clamp warning label to center oor brick prior
to mortar, ensuring verbiage is legible from front of rebox.
(Figure 16)
Step 4. Next, apply re brick to the back wall of the unit starting
at the bottom of the back wall and working upward to the top
of the back wall.
Step 5. Finally, set the side wall re brick by starting at the front
edge of the unit’s side wall and working inward toward the back
wall re brick.
Important: Be sure to bring the two high temperature wires
through the lower left hand side wall nished re brick. The
two high temperature wires need to be accessible for later
connection to the high temperature limit switch wires.
WARNING
WARNING:
Do Not Build a Wood Fire
Gas Fuel Only
For use with Isoflame Gas Logs
See Instructions
Do Not Remove This Label
Figure 16

High Temperature
Limit Switch
2 High Temperature
Wires
Tab to be bent upward
to stand vertical
(both sides)
18
IBV Assembly Instructions (cont.)
Metal Canopy Installation:
The metal canopy, as supplied, is forty ve inches
(45”) long and ts the IBV models 36 & 46. Field cut the metal
canopy equally at the perforated lines as required for the 36”
unit. This will ensure the limit switch and micro-switch are
located in the proper position on the lintel.
Connect the two (2) leads from the high temperature
wires to the thermocouple junction block (see diagram, page
29).
Measure and locate the centerline of the replace
opening. Align notch at the front of the lintel to the centerline
of the replace. Install lintel using 1 1/2” masonry screws.
Notes: The limit switch and microswitch are already supplied
and mounted in the IBV metal canopy component. Connect the
two high temperature wires (coming out the top of the IBV left
hand rebox side wall) to the two high temperature wires that
are attached to the limit switch with ceramic wire nuts.
The small tab near damper lever should be bent
upward to stand vertical. This protects wires passing through
the harness.
WARNING: Do not bypass the high temperature limit switch.
Install downdraft diverter at the top plate. (Figure 20)
Orient assembly such that the wire cable is toward the
front of the replace opening.
Loosen screws on the cable clamp and loop between
the two washers at the end of the handle asembly.
Note: Wire clamp should be approximately 4” from the washers.
Tighten lock nuts on the handle if necessary.
Pull cable to close the damper and adjust the length
of wire cable by swinging the handle between open and close
positions. When in the open position, the damper should be
rotated a full 90 degrees from the closed position.
Retighten screws on the cable clamp and remove
excess cable.
The metal canopy ts horizontally up toward the
bottom of the smoke dome. The adjoining short leg of the
metal canopy ts up against the bottom of the smoke dome
component. (Figure 19)
The metal canopy has 4 pilot holes for the screw placement.
Attach the metal canopy ush against the front face of
the smoke dome with 4 mounting screws driven into the face of
the IBV smoke dome.
Any excess wire draped between the metal canopy and
the left hand rebox sidewall should be neatly tucked into the
hollow core of the left hand sidewall. Excess wire should not be
visible below the canopy bottom.
The 2 high temperature wires inside of the IBV rebox
will connect to the appropriate contacts found on the gas log
assembly during the installation of the gas log set.
Front
Facing
Limit Switch
Terminals
Smoke Dome
Component
Metal Canopy
High Temperature
Limit Switch
Metal Canopy
Figure 17
Figure 18
Figure 19

19
Venting Installation
Anchor Plate/ Damper Installation:
Cut a twelve inch (12”) diameter hole in the center of
the ceramic ber blanket which is then placed on the top plate,
aligned with and centered on the ue hole in the top plate.
The IBV anchor plate assembly is then dropped into
the hole in the top plate so that the conical shaped down draft
diverter / in-line damper assembly hangs down into the smoke
chamber (Figure 20).
When properly installed the wire cable is toward the
the front of the replace.
The mounting ange connects to the IBV top plate
by setting four screws (one and one-quarter inch (1-1/4”)
galvanized drywall screws) through the ange, through the
ceramic ber blanket and into the IBV top plate.
To install B-Vent piping, slide the rst piece of ten inch
(10”) inside diameter B-Vent pipe over the IBV starter collar
and attach with either two screws or other means approved by
the vent
manufacturer.
Actual installations will vary due to individual job
requirements. However, always maintain required clearances to
combustible materials and do not violate any specic B-Vent
installation requirements - ANSI Z223.1 / NFPA 54. Check
with the B-Vent manufacturer regarding specic clearances.
Be sure that in every case where offsets are used that
they are properly supported and that re stops are used wherever
the vent passes through a sub-oor, ceiling joist ystem or an
attic overhang.
The vent pipe must terminate with a listed type vent
cap and extend through an approved roof ashing, roof jack or a
roof thimble vertically through the roof. Be sure to maintain the
listed clearances at all points of the vent system installation.
Listed vent cap
IBV Anchor Plate
with down draft diverter
Ceramic
Fiber Blanket
IBV Firebox
Figure 20

20
Venting Installation (cont.)
The IBV, per ANSI-Z21.50 standard, requires double wall, gas only B-
Vent metal piping for the purpose of venting the appliance to the outside
of the building.
Specications:
Gas code requirements concerning B-Type vent installations may
vary within state, province or local code jurisdictions. Therefore it is
recommended that you check with local building codes prior to installing
any B-Vent piping for specic requirements or, in the absence of local
codes follow Section 7.0 of the current National Fuel Gas Code ANSI
Z223.1, NFPA 54.
1. The IBV must be vented vertically out the top of the unit.
2. All B-Vent ue used with IBV must terminate vertically through the
roof.
3. All B-Vent ue used with IBV may not be terminated into an attic
space.
4. The B-Vent ue used with IBV must only be used for the IBV and not
shared with other venting systems.
5. Maintain a minimum one inch (1”) air space at all double wall B-Vent
metal pipe components.
6. Maintain a minimum two inch (2”) air space at all single wall B-Vent
metal pipe components.
Note: Check with pipe manufacturer for specic clearance
requirements.
7. Maintain a minimum three inch (3”) air space to all insulation and
vapor barriers.
8. Minimum required chimney height is one hundred inches (100”).
(Figure 21)
9. Maximum chimney offset angle is forty-ve degrees off of vertical.
(Figure 21)
11. Only one offset per chimney system is allowed.
CAUTION: Do not modify or alter metal ue or metal ue components
as this could result in an unsafe and potentially dangerous installation
that may cause a serious injury. Consult B-Vent manufacturer.
100” minimum
45º
maximum
angle
Figure 21