Heat & Glo COSMO-I30-IFT User manual

1
Heat & Glo • COSMO-I30-IFT, COSMO-I35-IFT Installation Manual • 2535-980 Rev. V • 10/23
Installation Manual
Installation and Appliance Setup
CAUTION! Risk of Fire! DO NOT store instruction manuals inside replace cavity. High temperatures
could cause a re.
INSTALLER: Leave this manual with the appliance, not inside the appliance.
CONSUMER: Retain this manual for future reference. Do not store inside the appliance
NOTICE: DO NOT discard this manual!
This appliance may be installed as an OEM
installation in manufactured home (USA
only) or mobile home and must be installed
in accordance with the manufacturer’s
instructions and the Manufactured Home
Construction and Safety Standard, Title 24
CFR, Part 3280 in the United States, or the
Standard for Installation in Mobile Homes,
CAN/CSA Z240 MH Series, in Canada.
This appliance is only for use with the type(s)
of gas indicated on the rating plate. This
appliance is not convertible for use with other
gases, unless a certied kit is used.
• DO NOT store or use gasoline or other am-
mable vapors and liquids in the vicinity of this
or any other appliance.
• 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.
- Leave the building immediately.
- Immediately call your gas supplier from
a neighbor’s phone. Follow the gas sup-
plier’s instructions.
- If you cannot reach your gas supplier, call
the re department.
• Installation and service must be performed
by a qualied installer, service agency, or the
gas supplier.
WARNING:
FIRE OR EXPLOSION HAZARD
Failure to follow safety warnings exactly
could result in serious injury, death, or
property damage.
DANGER
HOT GLASS WILL
CAUSE BURNS.
DO NOT TOUCH GLASS
UNTIL COOLED.
NEVER ALLOW CHILDREN
TO TOUCH GLASS.
A barrier designed to reduce the risk of
burns from the hot viewing glass is provided
with this appliance and must be installed for
the protection of children and other at-risk
individuals.
Models:
COSMO-I30-IFT
COSMO-I35-IFT
Pour demander un exemplaire en français de ce manuel
d’installation, visitez www.quadrare.com.

2Heat & Glo • COSMO-I30-IFT, COSMO-I35-IFT Installation Manual • 2535-980 Rev. V • 10/23
Safety Alert Key:
• DANGER! Indicates a hazardous situation which, if not avoided will result in death or serious injury.
• WARNING! Indicates a hazardous situation which, if not avoided could result in death or serious injury.
• CAUTION! Indicates a hazardous situation which, if not avoided, could result in minor or moderate injury.
• NOTICE: Used to address practices not related to personal injury.
Note: The term “recommend” or “recommended” does not indicate a requirement. It is a best practice suggested by Hearth
& Home Technologies®.
Table of Contents
Installation Standard Work Checklist....................3
1 Product Specic and Important Safety Information
A. Appliance Certication ............................4
B. Glass Specications..............................4
C. BTU Specications...............................4
D. High Altitude Installations ..........................4
E. Non-Combustible Materials Specication. . . . . . . . . . . . . . 4
F. Combustible Materials Specication .................4
G. Electrical Codes .................................4
H. California ......................................4
2 Getting Started
A. Design and Installation Considerations ............... 5
B. Good Faith Wall Surface ..........................7
C. Tools and Supplies Needed ........................7
D. Inspect Appliance and Components..................7
3 Appliance / Fireplace Requirements and
Clearances
A. Appliance/Decorative Barrier Front Dimension Diagrams . 8
B. Minimum Fireplace Opening ......................13
C. Zero Clearance Wall Extension ....................15
D. Mantel, Wall Projections, & Hearth Extensions ........17
E. Hearth Extension / Vinyl Flooring...................18
4 Installation Preparation
A. Cleaning ......................................20
B. Flue Damper. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
C. Gas Line...................................... 20
D. Fireplace Conversion Notice ......................20
E. Electrical Outlet Box.............................20
5 Installing Vent Pipe and Appliance
A. Vent Limits ....................................21
B. Using Vertical Restrictor..........................22
C. Venting Components ............................23
D. Connecting to SLP ..............................24
E. Connecting Vent Pipe............................25
F. Placing, Securing and Leveling the Appliance ......... 26
G. Installing Termination Cap ........................27
6 Electrical Information
A. General Information .............................28
B. Wiring Requirements ............................29
C. Installation / Service for Fan ......................30
7 Gas Information
A. Fuel Conversion ................................ 31
B. Gas Pressure ..................................32
C. Gas Connection ................................32
D. High Altitude Installations .........................33
E. Air Shutter Setting ..............................33
F. Service / Replace Appliance Gas Valve ..............33
8 Finishing
A. Mantel, Wall Projections & Hearth Extensions .........34
B. Hearth Extension ...............................35
9 Appliance Setup
A. Fixed Glass Assembly ...........................37
B. Remove the Shipping Materials ....................38
C. Clean the Appliance ............................. 38
D. Accessories ...................................38
E. Magic Glass Panels. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
F. Glass Media / Stone Placement.................... 41
G. Install Decorative Barrier Front and Surround .........42
H. Appliance Break-In ..............................43
I. Heat Management ..............................43
10 Reference Materials
A. Vent Components...............................44
B. Accessories ...................................45
= Contains updated information.



3
Heat & Glo • COSMO-I30-IFT, COSMO-I35-IFT Installation Manual • 2535-980 Rev. V • 10/23
Installation Standard Work Checklist
Customer:
Lot/Address:
Model (circle one): COSMO-I30-IFT, COSMO-I35-IFT
Date Installed:
Location of Fireplace:
Installer:
Dealer/Distributor Phone #
Serial #:
Comments: Further description of the issues, who is responsible (Installer/ Builder/ Other Trades, etc) and corrective
action needed _____________________________________________________________________________________
_________________________________________________________________________________________________
_________________________________________________________________________________________________
Comments Communicated to party responsible ____________________ by ______________________on ___________
(Builder / Gen. Contractor/) (Installer) (Date)
Appliance Install YES IF NO, WHY?
Veried replace is clean and remove/block open damper/modify
damper for vent pipe clearance (Section 4). ___________________________
Veried clearances to combustibles (Sections 3,5,8). ___________________________
Locate multi-purpose tool (Section 2). ___________________________
Appliance is leveled and secured (Section 5.F). ___________________________
Venting/Chimney Section 5
Exhaust and inlet ex vent pipe are properly formed and routed through
existing replace damper. ___________________________
Exhaust and inlet ex vent pipe are properly installed to the correct collars,
sealed and secured to top slide plate and to the termination cap. ___________________________
Vertical restrictors are properly set (if applicable). ___________________________
Exterior roof ashing installed and sealed. ___________________________
Termination cap installed, secured and sealed to top slide plate. ___________________________
Electrical Section 6
Unswitched power (110-120 VAC) provided to the appliance. ___________________________
Switch wires properly installed. ___________________________
Gas Section 7
Proper appliance for fuel type. ___________________________
Was a conversion performed? ___________________________
Leak check performed and inlet pressure veried. ___________________________
Veried proper air shutter setting for installation type. ___________________________
Finishing Section 8
Combustible materials not installed in non-combustible areas. ___________________________
Veried all clearances meet installation manual requirements. ___________________________
Mantels and wall projections comply with installation manual requirements. ___________________________
Appliance Setup Section 9
All packaging and protective materials removed (inside & outside of appliance). ___________________________
Refractories, logs, media and embers installed correctly. ___________________________
Glass assembly and glass seal plate installed and secured. ___________________________
Accessories installed properly. ___________________________
Surround and decorative front properly installed. See instructions shipped
with appliance front. ___________________________
Manual bag and all of its contents are removed from inside/under
the appliance and given to party responsible for use and operation. ___________________________
Fireplace warning plate is attached to the existing woodburning replace. ___________________________
Remote control is programmed, functions veried using remote control ___________________________
instructions.
Started appliance and veried no gas leaks exist. ___________________________
2535-982B 6/23
= Contains updated information.
Hearth & Home Technologies recommends the following:
• Photographing the installation and copying this checklist for your le.
• That this checklist remain visible at all times on the appliance until the installation is complete.
This standard work checklist is to be used by the installer in conjunction with, not instead of, the instructions contained in this
installation manual.
WARNING! Risk of Fire or Explosion! Failure to install appliance according to these instructions could
lead to a re or explosion.
ATTENTION INSTALLER:
Follow this Standard Work Checklist

4Heat & Glo • COSMO-I30-IFT, COSMO-I35-IFT Installation Manual • 2535-980 Rev. V • 10/23
A. Appliance Certication
E. Non-Combustible Materials Specication
Material which will not ignite and burn. Such materials are
those consisting entirely of steel, iron, brick, tile, concrete,
slate, glass or plasters, or any combination thereof.
Materials that are reported as passing ASTM E 136,
Standard Test Method for Behavior of Materials in
a Vertical Tube Furnace at 750 ºC shall be considered
non-combustible materials.
F. Combustible Materials Specication
Materials made of or surfaced with wood, compressed pa-
per, plant bers, plastics, or other material that can ignite
and burn, whether ame proofed or not, or plastered or
unplastered shall be considered combustible materials.
G. Electrical Codes
NOTICE: This appliance must be electrically wired
and grounded in accordance with local codes or, in the
absence of local codes, with National Electric Code
ANSI/NFPA 70-latest edition or the Canadian Electric
Code CSA C22.1.
• A 110-120 VAC circuit for this product must be pro-
tected with ground-fault circuit-interrupter protection,
in compliance with the applicable electrical codes,
when it is installed in locations such as in bathrooms
or near sinks.
11 Product Specic and Important Safety Information
This product is listed to ANSI standards for “Vented Gas
Fireplace Heaters” and applicable sections of “Gas Burn-
ing Heating Appliances for Manufactured Homes and
Recreational Vehicles”, and “Gas Fired Appliances for
Use at High Altitudes”.
NOT INTENDED FOR USE AS A PRIMARY HEAT SOURCE.
This appliance is tested and approved as either supplemen-
tal room heat or as a decorative appliance. It should not be
factored as primary heat in residential heating calculations.
NOTICE: This installation must conform with local codes.
In the absence of local codes you must comply with the
National Fuel Gas Code, ANSI Z223.1-latest edition in
the U.S.A. and the CAN/CGA B149 Installation Codes in
Canada.
B. Glass Specications
This appliance is equipped with ceramic glass. Replace
glass only with ceramic glass. Please contact your dealer
for replacement glass.
C. BTU Specications
MODELS: COSMO-I30-IFT, COSMO-I35-IFT
LABORATORY: Underwriters Laboratories, Inc. (UL)
TYPE: Direct Vent Heater
STANDARD: ANSI Z21.88-2019 CSA 2.33-2019
D. High Altitude Installations
NOTICE: If the heating value of the gas has been reduced,
these rules do not apply. Check with your local gas utility
or authorities having jurisdiction.
When installing above 2000 feet elevation:
• In the USA: Reduce input rate 4% for each 1000 feet
above 2000 feet.
• In CANADA: Input ratings are certied without a eduction
of input rate for elevations up to 4500 feet (1370 m)
above sea level. Please consult provincial and/or
local authorities having jurisdiction for installations at
elevations above 4500 feet (1370 m).
Check with your local gas utility to determine proper
orice size.
H. California
WARNING: This product and the fuels used to
operate this product (liquid propane or natural
gas), and the products of combustion of such fuels, can
expose you to chemicals including benzene, which is
known to the State of California to cause cancer and
reproductive harm. For more information go to: www.
P65Warnings.ca.gov.
Models
(U.S. or Canada)
Maximum
Input
BTU/h
Minimum
Input
BTU/h
Orice
Size (DMS)
COSMO-I30-IFT
(NG) (0-2000 FT) 28,000 19,600 38
COSMO-I30-IFT
(Propane) (0-2000 FT) 23,000 16,100 0.058 in.
COSMO-I35-IFT
(NG) (0-2000 FT) 30,000 21,000 37
COSMO-I35-IFT
(Propane) (0-2000 FT) 28,000 19,600 1.55 mm

5
Heat & Glo • COSMO-I30-IFT, COSMO-I35-IFT Installation Manual • 2535-980 Rev. V • 10/23
22 Getting Started
Improper installation, adjustment, alteration, service or
maintenance can cause injury or property damage. For
assistance or additional information, consult a qualied
service technician, service agency or your dealer.
A. Design and Installation Considerations
WARNING! Risk of Fire or Explosion! Read all instruc-
tions before starting the installation.
Gas inserts are designed for installations into solid fuel
masonry or UL127 listed factory built replaces. No ad-
ditional outside air source is required.
Installation MUST comply with local, regional, state and na-
tional codes and regulations. Consult insurance carrier, local
building inspector, re ofcials or authorities having jurisdic-
tion over restrictions, installation inspection and permits.
Prior to installing the gas insert:
• Ensure chimney is constructed of non-combustible
materials.
• Ensure chimney is clean and in good working order.
• Ensure that all chimney cleanouts t properly to prevent
air leakage into chimney.
• Ensure combustible mantel and surround clearances
comply with insert requirements.
• Ensure all joints are properly engaged and the chimney
is properly secured.
• Determine minimum replace size. See Section 3.A and
3.B.
• Determine gas supply piping requirements.
• Determine electrical wiring requirements.
• Determine nishing details.
• Determine whether optional accessories—devices such
as a wall switch or remote control—are desired.
Installation and service of this appliance should be performed by
qualied personnel. Hearth & Home Technologies recommends
HHT Factory Trained or NFI certied professionals.
Figure 2.1 Multi-Purpose Tool
GAS SHUT-OFF
DISENGAGE
SLIDE PLATE
ENGAGE
SLIDE PLATE
GLASS CLIPS
Multi-Purpose Tool
• See Figure 2.1 for multi-purpose tool functions and
features.
• See Figure 2.2 for multi-purpose tool shipping location.
• See Figure 2.3 for multi-purpose tool storage location
options.

6Heat & Glo • COSMO-I30-IFT, COSMO-I35-IFT Installation Manual • 2535-980 Rev. V • 10/23
Figure 2.3 Multi-Purpose Tool Storage Options
OPTION B
OPTION A
MULTI-PURPOSE TOOL
MULTI-PURPOSE
TOOL SHIPPED ZIP-
TIED IN THIS AREA OF
THE APPLIANCE
Figure 2.2 Multi-Purpose Tool shipping Location
OPTION C
Multi-purpose tool can be stored in appliance manual
bag.
Multi-purpose tool can be
stored behind the surround.
Multi-purpose tool can be
stored behind the appliance
front.
Multi-Purpose Tool - Shipping Location
Multi-Purpose Tool - Storage Options
NOTE: This is not an option for
all Inside Fit (INFIT) fronts.
• Remove multi-purpose tool by cutting and discarding
zip-tie.
• See Figure 2.3 for multi-purpose tool storage.
• See Figure 2.1 for multi-purpose tool features /functions.
DO NOT store appliance manual bag in or around
the appliance.

7
Heat & Glo • COSMO-I30-IFT, COSMO-I35-IFT Installation Manual • 2535-980 Rev. V • 10/23
D. Inspect Appliance and Components
• Carefully remove the appliance and components from
the packaging.
• The vent system components, decorative barrier fronts
and surrounds are shipped in separate packages.
• Glass media must be installed to ensure proper
performance. See your dealer for details.
• Report to your dealer any parts damaged in shipment,
particularly the condition of the glass.
•Read all of the instructions before starting the instal-
lation. Follow these instructions carefully during the
installation to ensure maximum safety and benet.
WARNING! Risk of Fire or Explosion! Damaged parts
could impair safe operation. DO NOT install damaged, in-
complete or substitute components. Keep appliance dry.
Hearth & Home Technologies disclaims any responsibility for,
and the warranty will be voided by, the following actions:
• Installation and use of any damaged appliance or vent
system component.
• Modication of the appliance or vent system.
• Installation other than as instructed by Hearth & Home
Technologies.
• Improper positioning of the gas logs or the glass door.
• Installation and/or use of any component part not approved
by Hearth & Home Technologies.
Any such action may cause a re hazard.
WARNING! Risk of Fire, Explosion or Electric Shock!
DO NOT use this appliance if any part has been under
water. Call a qualied service technician to inspect the
appliance and to replace any part of the control system
and/or gas control which has been under water.
C. Tools and Supplies Needed
Before beginning the installation be sure that the following
tools and building supplies are available.
Tape measure Pliers
Hammer Phillips screwdriver
Voltmeter Electric drill and bits (1/4 in.)
Gloves Safety glasses
Level Reciprocating saw
Manometer Flat blade screwdriver
Stove cement / Aluminum foil tape
3/16 in. Allen wrench (Rear Leveling Legs)
Elongated pressure taps (Recommended)
Noncorrosive leak check solution
Caulking material (300 ºF minimum continuous exposure
rating)
Figure 2.4 Good Faith Wall Surface Temperatures Above Appliance
B. Good Faith Wall Surface
NOTICE: Temperatures listed above are taken with a
temperature measuring probe as prescribed by the test
standard used for appliance certication. Temperatures
on walls or mantels taken with an infrared thermometer
may yield increased temperatures of up to 30 ºF or more
depending on the thermometer settings and material
characteristics being measured. Use appropriate nishing
materials that are able to withstand these conditions. For
additional nishing guidelines, see Section 8.
MEASUREMENTS FROM TOP
OF THE SURROUND OPENING
CEILING
APPLIANCE SURROUND
SURROUND
OPENING
18 IN.
22 IN.
16 IN.
12 IN.
24 IN.
28 IN.
34 IN.
40 IN.
46 IN.
52 IN.
151 ºF
138 ºF
135 ºF
127 ºF
125 ºF
120 ºF
115 ºF
110 ºF
108 ºF
106 ºF
If installing a television (TV) above the appliance, see
Section 3 of the appliance Owner’s Manual.

8Heat & Glo • COSMO-I30-IFT, COSMO-I35-IFT Installation Manual • 2535-980 Rev. V • 10/23
33 Appliance / Fireplace Requirements and Clearances
A. Appliance/Decorative Barrier Front Dimension Diagrams
Dimensions are actual appliance dimensions. Use for reference only. For additional clearances refer to Sections 3.D and 3.E.
Figure 3.1 Appliance Dimensions
*Note: Location G is the appliance depth measurement, for installation depth reference Location E on
Figure 3.9.
MODEL DIMENSIONS
Location 30 in. 35 in.
IN MM IN MM
A 19-5/8 499 24-5/8 626
B 31-1/8 791 36-1/8 918
C 27-1/2 699 32-1/2 826
D 15-15/16 405 19-3/8 492
E 20-3/4 527 24 610
F 20-1/8 511 23-5/8 600
G* 14-1/2 369 14-1/2 368
H 9-13/16 249 12-5/16 313
I 18-15/16 481 21-7/16 545
F
K
J
GAS LINE
ACCESS
C
D
E
R
I
A
H
B
G
O
N
P
Q
ELECTRICAL
ACCESS
L
M
MODEL DIMENSIONS
Location 30 in. 35 in.
IN MM IN MM
J 5-11/16 144 5-11/16 144
K 5-7/8 149 5-7/8 149
L 9 229 9 229
M 8-3/4 222 8-3/4 222
N 2-1/8 54 2-1/8 54
O 4-1/16 103 4-1/16 103
P 5-3/4 146 5-3/4 146
Q 8-3/4 222 8-3/4 222
R 2-7/16 62 2-7/16 62
TOP VIEW
LEFT SIDE
RIGHT SIDE
FRONT VIEW

9
Heat & Glo • COSMO-I30-IFT, COSMO-I35-IFT Installation Manual • 2535-980 Rev. V • 10/23
Figure 3.2 Decorative Barrier Front Dimensions - Inside Fit
DECORATIVE BARRIER FRONTS - INSIDE FIT
A B C D E F G
COSMO-I30-IFT INFIT-30 in. 27-5/8 16-1/16 1-7/8 30-5/8 20-1/2 20 1/2
mm 702 408 48 778 521 508 13
COSMO-I35-IFT INFIT-35 in. 32-5/8 19-9/16 1-7/8 35-5/8 24 23-1/2 1/2
mm 829 497 48 905 610 597 13
F
D
A
B
C
G
E
*NOTICE: 1/2 inch gap must be maintained
or components will overheat.
*
IMPORTANT! This replace requires an installed decorative barrier front to prevent direct contact with the hot
viewing glass. DO NOT operate the replace with the barrier removed.
Decorative barrier front must be ordered at time of replace purchase. If decorative barrier front is not present,
contact dealer.

10 Heat & Glo • COSMO-I30-IFT, COSMO-I35-IFT Installation Manual • 2535-980 Rev. V • 10/23
Figure 3.3 Decorative Barrier Front Dimensions - Firescreen
DECORATIVE BARRIER FRONTS - FIRESCREEN
A B C D E F G
COSMO-I30-IFT FS-MI30 in. 32-5/16 19-1/2 2-1/4 36 23-1/2 23 1/2
mm 821 495 57 914 597 584 13
COSMO-I35-IFT FS-MI35 in. 37-5/16 23-1/2 2-1/4 41 27 26-1/2 1/2
mm 948 597 57 1041 699 673 13
F
D
A
B
C
G
E
*
*NOTICE: 1/2 inch gap must be maintained
or components will overheat.

11
Heat & Glo • COSMO-I30-IFT, COSMO-I35-IFT Installation Manual • 2535-980 Rev. V • 10/23
Figure 3.4 Decorative Barrier Front Dimensions - Iron Age
DECORATIVE BARRIER FRONTS - IRON AGE
A B C D E F G
COSMO-I30-IFT IA-MI30 in. 28-9/16 17-1/16 2-3/8 36 23-1/2 23 1/2
mm 725 433 60 914 597 584 13
COSMO-I35-IFT IA-MI35 in. 33-9/16 20-1/2 2-3/8 41 27 26-1/2 1/2
mm 852 521 60 1041 686 673 13
F
D
A
B
C
G
E
*
*NOTICE: 1/2 inch gap must be maintained
or components will overheat.

12 Heat & Glo • COSMO-I30-IFT, COSMO-I35-IFT Installation Manual • 2535-980 Rev. V • 10/23
Figure 3.5 Decorative Barrier Front Dimensions - Halston Arch
DECORATIVE BARRIER FRONTS - HALSTON ARCH
A B C D E F G
COSMO-I30-IFT HARC-MI30 in. 31-3/8 15-9/16 3-7/8 36-1/4 23-1/2 23 1/2
mm 797 395 98 921 597 584 13
COSMO-I35-IFT HARC-MI35 in. 36-3/8 19-1/16 3-7/8 41-1/4 27 26-1/2 1/2
mm 924 484 98 1048 686 673 13
F
D
A
B
C
G
E
*
*NOTICE: 1/2 inch gap must be maintained
or components will overheat.

13
Heat & Glo • COSMO-I30-IFT, COSMO-I35-IFT Installation Manual • 2535-980 Rev. V • 10/23
B. Minimum Fireplace Opening
Minimum replace opening requirements for a standard 3/4
inch deep surround are shown in Figure 3.9. For smaller
openings, a custom surround is available.
WARNING! Risk of Fire or Burns! Provide adequate
clearance around air openings and for service access.
Due to high temperatures, the appliance should be locat-
ed out of trafc and away from furniture and draperies.
For Installation into a Zero Clearance Wood burning re-
place:
• The brick (refractory), glass doors, screen rails, screen
mesh and log grates can be removed from a factory
built rebox in order to gain minimum gas insert opening
requirements.
• Any smoke shelves, shields and bafes may be removed
from the factory built rebox if attached with mechanical
fasteners.
Figure 3.6 Solid Fuel Floor Clearance
SIDE VIEW
MINIMUM 1/4 IN. REQUIRED
COMBUSTIBLE FLOOR UNDERNEATH APPLIANCE
• The appliance may not be placed directly on the base of
the outer wrap, a 1/4 inch airspace MUST be provided
between the insert and the oor of the outer wrap. Use
the leveling legs to raise the insert a minimum of 1/4 inch.
The original replace may never be returned to solid
fuel in this condition. The sidewalls and top structure
of the rebox may not be altered with the exception of
removable bafes and dampers. 1/2 in.
NOTICE: 1/2 inch gap must be maintained or components
will overheat.
Figure 3.8 Minimum Required 1/2 in. Gap
• Cutting of any sheet metal parts of the replace in which
the gas replace insert is to be installed is prohibited,
except the oor and front lip as tested for and as noted
above. See Section 4.C for gas line exception.
• A minimum 1/4 inch gap from the bottom of the appliance
to the metal oor of the solid fuel rebox is REQUIRED.
See side view in Figure 3.6.
• Manufactured gas inserts can be installed as a zero
clearance wall extension appliance. See Section 3C for
clearance detail.
• The metal oor of the solid fuel rebox may be removed
to facilitate the installation of the insert.
• A metal lip protuding above the hearth pad of the solid
fuel rebox may be removed. See Figure 3.7.
Figure 3.7 Solid Fuel Firebox
HEARTH PAD
ACCEPTABLE
TO REMOVE

14 Heat & Glo • COSMO-I30-IFT, COSMO-I35-IFT Installation Manual • 2535-980 Rev. V • 10/23
Figure 3.9 Firebox Opening - Standard Surround - 3/4 in.
Custom Surrounds
Custom surrounds are available. See your dealer for information. Standard surrounds are 3/4 inches deep. Custom
surrounds are available up to 3 inches deep. A 3 inch deep surround would reduce the unit opening depth (E*) by 2-1/4
inches (3 in. - 3/4 in. = 2-1/4 in).
In addition to these dimensions, also reference Section 3.D and 3.E.
APPLIANCE TOP VIEW FIREBOX FRONT VIEW FIREBOX SIDE VIEW
*Unit depth is measured to the back of the surround to give the depth needed for installation.
F
D
C
A
B
F
E
7/8 in.
(Standard)
2 in.
(Deep)
MINIMUM FIREBOX OPENING
Location
30 inch 35 inch
Inches Millimeters Inches Millimeters
A Opening Width - Rear 20-1/8 511 25-1/8 638
B Opening Width - Front 31-5/8 803 36-5/8 930
C Opening Height - Front 21 533 24-1/4 616
D Opening Height - Rear 19-3/16 487 21-11/16 551
E* Unit Opening Depth 15 381 15 381
F Venting Depth - Front 7-5/8 194 7-5/8 194
Note: Dimensions assume 1/4 inch clearance on all sides.
Note: If exhaust collar on insert and replace damper do not line up, add 4 inches (102 mm) to minimum
replace height for bends in vent pipe.
On Site Custom Surrounds
On site custom surrounds are available. See your dealer for information. On site custom surrounds are ush and have
no depth. A ush surround would increase the unit opening depth (E*) by 3/4 inch.
2 INCH DEEP SURROUND MINIMUM FIREBOX OPENING
Location
30 inch 35 inch
Inches Millimeters Inches Millimeters
B Alternate Opening Width - Front 31 787 36 914
C Alternate Opening Height - Front 21 533 24-1/4 616
E Alternate Unit Opening Depth 14 356 14 356
Note: 2 inch deep surrounds, in medium size black nish have been created as standard accessory.
Sku Names: MI30-4230D-BK, MI35-4432D-BK

15
Heat & Glo • COSMO-I30-IFT, COSMO-I35-IFT Installation Manual • 2535-980 Rev. V • 10/23
C. Zero Clearance Wall Extension
Figure 3.11 Non-Combustible Facing Requirement
Figure 3.10 Non-Combustible Framing Requirement
FLOOR
EXISTING MASONRY WALL
NEW WALL
FACE
WALL EXTENSION
NON-COMBUSTIBLE ZONE
Figure 3.12 Non-Combustible Framing / Facing Requirement
WARNING! Risk of Fire! Comply with all minimum clear-
ances to combustibles as specied. Framing or nishing
material closer than the minimums listed must be construct-
ed entirely of noncombustible materials (i.e., steel studs,
concrete board, etc).
Combustible facings must not extend behind the insert
surround. See Figure 1.E and 1.F.
Non-Combustible Materials Specication
Material which will not ignite and burn. Such materials are
those consisting entirely of steel, iron, brick, tile, concrete,
slate, glass or plasters, or any combination thereof.
Materials that are reported as passing ASTM E 136,
Standard Test Method for Behavior of Materials in a
Vertical Tube Furnace at 750 ºC.
• Facing and/or nishing materials must not interfere with
air ow through decorative barrier fronts.
• Facing and/or nishing materials must never overhang
into the glass opening.
• Observe all clearances when applying combustible
materials.
• Maximum depth of wall extension is 12 inches. This
may be limited by the ex pipe’s ability to connect to the
starting collar.
• Covering combustible materials with non-combustible
materials does not qualify material as non-combustible.
WARNING! Risk of Fire! DO NOT apply combustible
materials beyond the minimum clearances. Comply with
all minimum clearances to combustibles as specied in
this manual. Overlapping materials could ignite and will
interfere with proper operation of decorative barrier fronts.
FLOOR
x
Y
NON-COMBUSTIBLE ZONE
C
L
EXISTING MASONRY WALL
NEW WALL
FACE
WALL EXTENSION
FLOOR
x
Y
NON-COMBUSTIBLE ZONE
C
L
UNIT X (min) Y
(min)
30 in. 33-1/2 56
35 in. 36 60
UNIT X
(min)
Y
(min)
30 in. 33-1/2 56
35 in. 36 60
12 in. max.
DEPTH
A non-combustible wall extension can be used to cover
an existing masonry surface. Wall extensions are typically
used to improve cosmetics.
Surrounds MUST overlap wall extension.
X - Minimum - measure from
center of rebox opening.
Y - Minimum - measure from
the bottom of the appliance.
X - Minimum - measure from
center of rebox opening.
Y - Minimum - measure from
the bottom of the appliance.

16 Heat & Glo • COSMO-I30-IFT, COSMO-I35-IFT Installation Manual • 2535-980 Rev. V • 10/23
FACING
STEEL STUD
END VIEW
MASONRY
WALL
STEEL STUD
SIDE VIEW
SEAL
TRANSITION
12 in.
MAXIMUM
APPLIANCE
SEAL STEEL
STUDS
Figure 3.13 Transition Sealing Detail for Wall Extensions (Side View)
Painting
If desired nishing includes a painted wall, a high-quality
100% acrylic latex paint with a high-quality latex primer
base coat are recommended around the appliance to limit
discoloration. Oil-based or standard acrylic paints may
be more prone to discoloration due to heat exposure.
Drywall Joint-Crack Prevention and Repair
Drywall joints around the replace will be affected by ex-
posure to elevated temperatures, along with other envi-
ronmental, structural factors due to new construction, and
methods used to install and nish the drywall. If a crack
does emerge adjacent to the replace, it can be perma-
nently repaired by lling it with a paintable latex caulk,
followed by repainting.
Some movement of the screws used to secure the non-
combustible board to the appliance/surround framing is
expected. If a blemish begins to show over a screw head,
sand the surface to remove the blemish and repaint.
Wall Extension
Wall extension must be sealed to existing masonry
wall. See Figure 3.13. Framing studs may not sit ush
against existing masonry wall. In order to keep heat
from escaping behind the wall this transition must be
sealed. Also, slots in steel studs must be sealed.
• Seal with a high temperature silicone 300 °F.
and / or
• Packing insulation into voids between the masonry wall
and steel studs is acceptable.
Note: Combustible materials may be used to seal wall
extension to existing masonry wall as long as it is out-
side the non-combustible zone.
NOTE: Concealed sections of 3 in. ex pipe must
be contained inside existing masonry replace
ue vent or installed into an existing wood burn-
ing vent system.

17
Heat & Glo • COSMO-I30-IFT, COSMO-I35-IFT Installation Manual • 2535-980 Rev. V • 10/23
D. Mantel, Wall Projections, & Hearth
Extensions
WARNING! Risk of Fire! Comply with all minimum clear-
ances to combustibles as specied. Framing or nishing
material closer than the minimums listed must be construct-
ed entirely of noncombustible materials (i.e., steel studs,
concrete board, etc).
Clearance to combustible material under the insert is 1/4
inch (6 mm).
• Use leveling legs to raise insert minimum 1/4 inch (6
mm) above combustible material or outer wrap of factory
built rebox.
Combustible facings must not extend behind the insert
surround. For non-combustible material specications
refer to Section 1.E and 1.F.
Mantel Legs or Wall Projections
INTERIOR WALL
TOP VIEW
MANTEL LEG OR WALL PROJECTIONS
SURROUND OPENING
∞
18 in.
12 in.
12 in.
1/4 in. GAP
6 in.
6 in.
4 in. 2 in.
Figure 3.14 Clearances to Mantel Legs or Wall Projections
(Acceptable on both sides of surround opening)
Figure 3.15 Minimum Vertical and Maximum Horizontal
Dimensions- Non-Combustible
Mantels or Wall Projections - Non-Combustible
1/4 in. gap
SURROUND
OPENING
6 in.
12 in.
12 in.
*B
*SEE TABLE
1 or 2
Note: Measurement is taken from top of the surround
opening.
Non-Combustible
Combustible
INTERIOR WALL
TOP VIEW
MANTEL LEG OR
WALL PROJECTIONS
SURROUND OPENING
1/4 in. Gap
A
*
C
L
*SEE TABLE
1 or 2
∞
18 in.
12 in.
12 in.
6 in.
6 in.
4 in. 2 in.
Unit Size Surround
Model A B
30 in.
MI30-4027 20-7/16 in. 6-9/16 in.
MI30-4230 21-7/16 in. 9-9/16 in.
MI30-4432 22-7/16 in. 11-9/16 in.
35 in.
MI35-4229 21-7/16 in. 5-1/16 in.
MI35-4432 22-7/16 in. 8-1/16 in.
MI35-4832 24-7/16 in. 8-1/16 in.
Table 1 Mantel Leg or Wall Projection Minimum Dimension
needed when Installing a Standard Surround
Note: All numbers in Tables 1 and 2 include the 1/4 in. gap on
surround edge.
Unit
Size Front Model A B
30 in. INFIT 16-13/16 in. 1-1/4 in.
FS-MI, IA-MI, HARC-MI 18-9/16 in. 2-1/2 in
35 in. INFIT 19-5/16 in. 1-1/4 in.
FS-MI, IA-MI, HARC-MI 21-1/16 in. 2-1/2 in
Table 2 Mantel Leg or Wall Projection Minimum Dimension
needed when Installing a Custom Surround. Front Model
Determines the Minimum Size of the Custom Surround

18 Heat & Glo • COSMO-I30-IFT, COSMO-I35-IFT Installation Manual • 2535-980 Rev. V • 10/23
Mantels - Combustible
Figure 3.16 Minimum Vertical and Maximum Horizontal
Dimensions - Combustible
Measurement to bottom
of appliance:
= 32-3/4 IN. (30")
= 36-1/4 IN. (35")
Measurement
from surround
opening.
12 in.
12 in.
E. Hearth Extension / Vinyl Flooring
1/2 in.
Figure 3.17. Minimum Required 1/2 in. Gap to Bottom of Front
• All ooring and hearth material must remain below the
bottom of the surround. See Figure 3.18.
• Combustible ooring may be located in front of
the appliance. See Figure 3.19 for vinyl ooring
recommendations.
• 1/2 inch gap under the bottom of the front must be
maintained. See Figure 3.17.
• A minimum 1/4 inch gap from the bottom of the appliance
to the metal oor of the solid fuel rebox is REQUIRED.
See side view in Figure 3.20.
• Combustible flooring underneath the appliance is
acceptable with a 1/4 inch gap. See Figure 3.20.
SURROUND
Flooring & Hearth Material
SURROUND
YES NO
Flooring & Hearth Material
Flooring & hearth material must remain below the bottom of surround
Figure 3.18 Flooring & Hearth Material

19
Heat & Glo • COSMO-I30-IFT, COSMO-I35-IFT Installation Manual • 2535-980 Rev. V • 10/23
Figure 3.20 Solid Fuel Floor Clearance
SIDE VIEW
MINIMUM 1/4 IN. REQUIRED
COMBUSTIBLE FLOOR UNDERNEATH APPLIANCE
12 IN. MIN.
APPLIANCE WIDTH MIN.
12 IN. MIN.
VINYL
Figure 3.19 Vinyl Flooring Recommendations
Vinyl Flooring
Vinyl ooring is sensitive to heat. To avoid damage to
the vinyl ooring, a 12 inch minimum x 12 inch mini-
mum hearth is recommended when using vinyl ooring
up to the wall. See Figure 3.19. If no hearth is used,
it is recommended to provide a minimum of 24 inches
of clearance in front of the appliance to the vinyl oor-
ing OR the bottom of the appliance should be raised a
minimum of 24 inches off of the oor to allow the vinyl
ooring to be installed up to the wall.
NOTICE: Clearances that do not meet the minimum
guidelines could result in damage or buckling to the vinyl
ooring and is done at the installer’s risk.
Hearth and Home Technologies does not recommend
adhesive based vinyl ooring products due to thermal ex-
pansion during operation. Floating style ooring can be
used, but it will reach temperatures up to 110 °F (based
on ambient temperature of 70 °F). Consult the manufac-
turer’s ooring specications to ensure compatibility.

20 Heat & Glo • COSMO-I30-IFT, COSMO-I35-IFT Installation Manual • 2535-980 Rev. V • 10/23
44 Installation Preparation
Prepare the existing solid fuel masonry or factory built
non-combustible rebox for installation.
A. Cleaning
Prior to installing the gas insert:
• Ensure that the woodburning replace cavity is clean
and free of ash, soot, and other debris.
B. Flue Damper
Fully lock the solid fuel replace’s ue damper in the open
position, OR completely remove it.
C. Gas Line
Note: If the factory-built replace has no gas access hole
provided, an access hole of 1 inch (25 mm) diameter or
less may be drilled through the lower sides or bottom of the
rebox in a proper workmanship - like manner. This access
hole must be plugged with non-combustible insulation after
the gas supply line has been installed.
• If the gas access hole of the factory-built replace is not
accessible or prohibits the installation due to its location,
an access hole may be drilled through the lower side,
back or bottom of rebox.
• The lower sides, back, or bottom is considered the lower
half of the factory-built rebox.
• Install gas line to the factory provided ex line. See
Figure 4.1.
• Check local codes and gas line sizing requirements
following NFPA54. See Section 7.
• It is recommended that extra length of gas line be
installed within the existing wood burner or masonry
replace to allow removal of the insert for future servicing
needs.
D. Fireplace Conversion Notice
The replace conversion notice is included in the appliance
manual bag. Permanently attach the label with the follow-
ing warning to the inside lower back of the replace rebox
into which the insert is being installed. Silicone or mechani-
cal fasteners may be required to properly secure the label.
WARNING! Risk of Fire! This replace has been con-
verted for use with a gas replace insert only and cannot
be used for burning wood or solid fuels unless all original
parts have been replaced, and the replace re-approved
by the authority having jurisdiction.
E. Electrical Outlet Box
An outlet box may be installed in a bottom back corner of
the existing solid fuel masonry or factory-built replace
to power the appliance. Each unit ships standard with a
cord assembly to permit blowers or other optional acces-
sories to be used. The accessories plug into the new out-
let box or may be routed out onto the hearth to a nearby
outlet.
ELECTRICAL OUTLET LOCATIONS
MASONRY
MASONRY
APPLIANCE
RECOMMENDED
NOTICE: DO NOT wire 110-120 VAC to wall switch.
Figure 4.2 Electrical Outlet Detail
Figure 4.1
Appliance Size Left Side Right Side
30 in. 10 ft. 3 in. 7 ft. 6 in.
35 in. 10 ft. 7 ft.
Appliance Cord Length (approximate)