Heatilator NBV30-IFT User manual

1
Heatilator • NBV30-IFT, NBV33-IFT, NBV36-IFT, NBV42-IFT Installation Manual • 2624-980 Rev. E • 10/20
Installation Manual
Installation and Appliance Setup
NOTICE: DO NOT discard this manual!
• 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.
Model(s):
NBV30-IFT
NBV33-IFT
NBV36-IFT
NBV42-IFT
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.
Contact your dealer with questions regarding installation, operation or service.
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.
Decorative barrier front must be ordered separately at
time of appliance purchase. See Section 3.A.

Heatilator • NBV30-IFT, NBV33-IFT, NBV36-IFT, NBV42-IFT Installation Manual • 2624-980 Rev. E • 10/20
2
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®. Failure to perform the recommended task will not result in a safety concern.
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. . . . . . . . . . . . . . 5
F. Combustible Materials Specication .................5
G. Electrical Codes .................................5
H. California ......................................5
2 Getting Started
A. Design and Installation Considerations ...............6
B. Good Faith Wall Surface ..........................6
C. Tools and Supplies Needed ........................6
D. Inspect Appliance and Components ..................7
E. Negative Pressure ...............................8
3 Framing and Clearances
A. Appliance/Decorative Front Dimension Diagrams ....... 9
B. Appliance Location and Clearances to Combustibles ...13
C. Constructing the Appliance Chase .................. 15
4 Termination Location and Vent Information
A. Vent Termination Minimum Clearances ..............16
5 Vent Information and Diagrams
A. Vent Guidelines ................................17
B. Vent System Conguration ........................ 17
C. Vent Diagrams .................................17
6 Vent Clearances and Framing
A. Pipe Clearances to Combustibles ..................21
B. Wall and Ceiling Penetration Framing ...............21
C. Vertical Penetration Framing ......................21
D. Pipe Clearances to Combustibles ..................21
E. Prepare For Heat Management ....................21
7 Appliance Preparation
A. Installing Outside Air Kit Damper Assembly ........... 22
B. Gas and Electrical Connections ....................22
C. Securing and Leveling the Appliance ................ 22
8 Venting and Chimneys (Installing Vent Pipe)
A. Assemble Vent Sections. . . . . . . . . . . . . . . . . . . . . . . . . . 23
B. Attaching Vent to Firebox ........................23
C. Securing Vent Sections ..........................23
D. Install Attic Insulation Shield .......................23
9 Electrical Information
A. General Information .............................24
B. Wiring Requirements ............................25
10 Gas Information
A. Fuel Conversion ................................27
B. Gas Pressure ..................................27
C. Gas Connection ................................27
D. High Altitude Installations ......................... 27
E. Air Shutter Setting ..............................28
11 Finishing
A. Facing Material .................................29
B. Mantel and Wall Projections .......................29
C. Non-combustible Mantel and Wall Projections .........30
12 Appliance Setup
A. Remove the Shipping Materials .................... 31
B. Clean the Appliance .............................31
C. Install Optional Refractory Kit ......................31
D. Install Burner Mineral Wool .......................31
E. Install Fixed Glass Assembly ...................... 32
F. Install Decorative Barrier Front. . . . . . . . . . . . . . . . . . . . . 32
G. Install the Log Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . 33
13 Reference Materials
A. Optional Accessories ............................ 35
 = Contains updated information.


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Heatilator • NBV30-IFT, NBV33-IFT, NBV36-IFT, NBV42-IFT Installation Manual • 2624-980 Rev. E • 10/20
Installation Standard Work Checklist
Customer:
Lot/Address:
Model (circle one): NBV30-IFT, NBV33-IFT
NBV36-IFT, NBV42-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 that the chase is insulated and sealed. (Pg. 15) ___________________________
Veried clearances to combustibles. (Pg. 13-14) ___________________________
Fireplace is leveled and secured. (Pg. 22) ___________________________
Venting/Chimney Section 8 (Pg 23)
Venting conguration complies to vent diagrams. ___________________________
Venting installed, locked and secured in place with proper clearance. ___________________________
Firestops installed. ___________________________
Attic insulation shield installed. ___________________________
Exterior wall/Roof ashing installed and sealed. ___________________________
Terminations installed and sealed. ___________________________
Electrical Section 9 (Pg 24-26)
Unswitched power (110-120 VAC) provided to the appliance. ___________________________
Switch wires properly installed. ___________________________
Gas Section 10 (Pg 27-28)
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 11 (Pg 29-30)
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 12 (Pg 31-34)
All packaging and protective materials removed (inside & outside of appliance). ___________________________
Refractories, logs, mineral wool, lava rock and vermiculite installed correctly. ___________________________
Glass assembly installed and secured. ___________________________
Accessories installed properly. ___________________________
Decorative barrier front properly installed. ___________________________
Manual bag and all of its contents are removed from inside/under
the appliance and given to party responsible for use and operation. ___________________________
Started appliance and veried no gas leaks exist. ___________________________
2624-982B 3/20
= 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. Install ONLY components and accessories approved by Hearth & Home Technologies.
Unapproved components and accessories could cause replace to overheat.
ATTENTION INSTALLER:
Follow this Standard Work Checklist

Heatilator • NBV30-IFT, NBV33-IFT, NBV36-IFT, NBV42-IFT Installation Manual • 2624-980 Rev. E • 10/20
4
B. Glass Specications
Hearth & Home Technologies appliances manufactured
with tempered glass may be installed in hazardous lo-
cations such as bathtub enclosures as dened by the
Consumer Product Safety Commission (CPSC). The
tempered glass has been tested and certied to the re-
quirements of ANSI Z97.1 and CPSC 16 CFR 1202
(Safety Glazing Certication Council SGCC# 1595 and
1597. Architectural Testing, Inc. Reports 02-31919.01
and 02-31917.01).
This statement is in compliance with CPSC 16 CFR Sec-
tion 1201.5 “Certication and labeling requirements”
which refers to 15 U.S. Code (USC) 2063 stating “…Such
certicate shall accompany the product or shall otherwise
be furnished to any distributor or retailer to whom the
product is delivered.”
Some local building codes require the use of tempered
glass with permanent marking in such locations. Glass
meeting this requirement is available from the factory.
Please contact your dealer or distributor to order.
C. BTU Specications
MODELS: NBV30-IFT, NBV33-IFT,
NBV36-IFT, NBV42-IFT
LABORATORY: Underwriters Laboratories, Inc. (UL)
TYPE: Vented Gas Fireplaces
STANDARD: CSA / ANSI Z21.88:19 • CSA 2.33:19
A. Appliance Certication
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.
11 Product Specic and Important Safety Information
Models
(U.S. or Canada)
Maximum
Input
BTU/h
Minimum
Input
BTU/h
Orice
Size
(DMS)
NBV30-IFT
(NG) (0-2000 FT) 20,000 14,000 .083 in.
NBV30-IFT
(Propane) (0-2000 FT) 17,000 14,000 .053 in.
NBV33-IFT
(NG) (0-2000 FT) 22,000 15,000 #43
NBV33-IFT
(Propane) (0-2000 FT) 22,000 15,000 #54
NBV36-IFT
(NG) (0-2000 FT) 25,000 17,000 #42
NBV36-IFT
(Propane) (0-2000 FT) 25,000 17,000 .058 in.
NBV42-IFT
(NG) (0-2000 FT) 30,000 20,500 #37
NBV42-IFT
(Propane) (0-2000 FT) 30,000 22,500 #52
This product is listed to ANSI standards for “Vented Gas
Fireplaces”. May be installed in a sleeping room when
the provisions for combustion, ventilation and dilution air
are met per the requirements of ANSI Z223.1/NFPA 54
National Fuel Gas Code. In Canada, installation in a
sleeping room requires installation with a thermostat certi-
ed for use with this product. Consult your local authorities
having jurisdiction.
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: Reduce input rate 10% for elevations
between 2000 feet and 4500 feet. Above 4500 feet,
consult local gas utility.
Check with your local gas utility to determine proper orice
size.
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.

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Heatilator • NBV30-IFT, NBV33-IFT, NBV36-IFT, NBV42-IFT Installation Manual • 2624-980 Rev. E • 10/20
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.
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.

Heatilator • NBV30-IFT, NBV33-IFT, NBV36-IFT, NBV42-IFT Installation Manual • 2624-980 Rev. E • 10/20
6
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.
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.
A. Design and Installation Considerations
WARNING! Risk of Fire or Explosion! Read all instruc-
tions before starting the installation.
Heatilator B-vent type gas appliances are designed to op-
erate with all combustion air siphoned from outside of the
building and all exhaust gases expelled to the inside. No
additional outside air source is required.
Installation MUST comply with local, regional, state and
national codes and regulations. Consult insurance carrier,
local building inspector, re ofcials or authorities having
jurisdiction over restrictions, installation inspection and
permits.
Before installing, determine the following:
• Where the appliance is to be installed.
• The vent system conguration to be used.
• Gas supply piping requirements.
• Provisions for optional heat management system.
• Electrical wiring requirements.
• Framing and nishing details.
• Whether optional accessories—devices such as a fan,
wall switch, or remote control—are desired.
MEASUREMENTS FROM
TOP EDGE OF THE OPENING
6 in.
18 in.
24 in.
30 in.
36 in.
48 in.
TO CEILING
42 in.
12 in.
123°F
115°F
120°F
132°F
145°F
170°F
180°F
APPLIANCE FRONT
APPLIANCE OPENING
110°F
Figure 2.1 Good Faith Wall Surface Temperatures Above Appliance
B. Good Faith Wall Surface
C. Tools and Supplies Needed
Before beginning the installation be sure that the following
tools and building supplies are available.
Hand Tools Tape measure
Level Framing material
Manometer Framing square
Voltmeter Electric drill and bits (1/4 in.)
Plumb line Safety glasses/Gloves
Wrenches Reciprocating saw
1/4 in. nut driver
Non-corrosive leak check solution
1/2 - 3/4 in. length, #6 or #8 Self-drilling screws
1/4 in. length, #6 or #8 Self-drilling screws (B-Vent only)
Caulking material (300 ºF minimum continuous exposure
rating)
NOTICE: Surface 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 °F (17 °C) 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 11.

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Heatilator • NBV30-IFT, NBV33-IFT, NBV36-IFT, NBV42-IFT Installation Manual • 2624-980 Rev. E • 10/20
D. Inspect Appliance and Components
WARNING! Risk of Fire or Explosion! Damaged parts
could impair safe operation. DO NOT install damaged, in-
complete or substitute components. Keep appliance dry.
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.
• Carefully remove the appliance and components from
the packaging.
• The vent system components and decorative barrier
fronts may be shipped in separate packages.
• If packaged separately, the log set and appliance grate
must be installed.
• Report to your dealer any parts damaged in shipment.
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 logs/media (as applicable) or
the glass assembly.
• Installation and/or use of any component part not approved
by Hearth & Home Technologies.

Heatilator • NBV30-IFT, NBV33-IFT, NBV36-IFT, NBV42-IFT Installation Manual • 2624-980 Rev. E • 10/20
8
Recommended
Location
Marginal
Location
Location
Not
Recommended
Recommended
Location
Multi-level Roofs
Windward
Leeward
Location
Not
Recommended
Figure 2.2
E. Negative Pressure
WARNING! Asphyxiation Risk! Negative pressure can cause
spillage of combustion fumes and soot. Fireplace needs to draft
properly for safety.
Draft is the pressure difference needed to vent replaces
successfully. Considerations for successful draft include:
• Preventing negative pressure
• Location of replace and chimney
Negative pressure results from the imbalance of air
available for the replace to operate properly. Causes for
this imbalance include:
• Exhaust fans (kitchen, bath, etc.)
• Range hoods
• Combustion air requirements for furnaces, water
heaters and other combustion appliances
• Clothes dryers
• Location of return-air to furnace or air conditioning
• Imbalances of the HVAC air handling system
• Upper level air leaks (recessed lighting, attic hatch
opening, duct leaks)
To minimize the effects of negative air pressure, the fol-
lowing must be considered:
• Install the fresh air kit. Install the intake on the side of
the house towards prevailing winds during the heating
season.
• Ensure adequate outdoor air is supplied for combustion
appliances and exhaust equipment.
• Ensure furnace and air conditioning return vents are
not located in the immediate vicinity of the replace.
• Avoid installing the replace near doors, walkways or
small isolated spaces.
• Recessed lighting should be of “sealed can” design;
attic hatches weather stripped or sealed; and attic
mounted ductwork and air handler joints and seams
taped or sealed.
• Basement installations should be avoided due to stack
effect. Stack effect creates negative pressure in lower
levels. Hearth & Home Technologies recommends the
use of direct vent replaces in basements.
Location of the replace and chimney will affect perfor-
mance. As shown in Figure 2.2, the chimney should:
• Be installed through the warm space enclosed by the
building envelope. This helps to produce more draft,
especially during lighting and die-down of the re.
• Penetrate the highest part of the roof. This minimizes
the effects of wind turbulence.
• Be located away from trees, adjacent structures,
uneven roof lines and other obstructions.
Offsets can restrict draft so their use should be mini-
mized. Consider the replace location relative to oor
and ceiling and attic joists.

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Heatilator • NBV30-IFT, NBV33-IFT, NBV36-IFT, NBV42-IFT Installation Manual • 2624-980 Rev. E • 10/20
33 Framing and Clearances
Appliance Dimensions Table
A. Appliance/Decorative Front Dimension Diagrams
Dimensions are actual appliance dimensions. Use for reference only. For framing dimensions and clearances refer to Section 5.
Figure 3.1 Appliance Dimensions
NBV30-IFT NBV33-IFT NBV36-IFT NBV42-IFT
Location Inches Millimeters Inches Millimeters Inches Millimeters Inches Millimeters
A35 889 38 965 41 1041 47 1194
B30 762 33 838 36 916 42 1067
C6-3/8 162 6-3/8 162 6-3/8 162 6-3/8 162
D19-7/8 505 19-7/8 505 19-7/8 505 19-7/8 505
E26-5/8 676 29-5/8 752 32-5/8 829 38-5/8 981
F31-1/2 800 31-1/2 800 31-1/2 800 31-1/2 800
G35-1/4 895 35-1/4 895 35-1/4 895 35-1/4 895
H15-3/4 400 15-3/4 400 15-3/4 400 15-3/4 400
I1-3/4 44 1-3/4 44 1-3/4 44 1-3/4 44
J376 376 376 376
K6-1/2 165 mm 6-1/2 165 mm 6-1/2 165 6-1/2 165
L34-1/2 876 34-1/2 876 34-1/2 876 34-1/2 876
M8-5/8 219 11-5/8 295 14-5/8 372 20-5/8 524
N4-3/8 111 5-7/8 149 7-3/8 187 10-3/8 264
O11-5/8 295 11-5/8 295 11-5/8 295 11-5/8 295
P19-1/8 486 19-1/8 486 19-1/8 486 19-1/8 486
Q2-3/8 60 2-3/8 60 2-3/8 60 2-3/8 60
R8203 8203 8203 8203
P
O
Q
R
I
HALTERNATE
GAS ACCESS
C
D
B
A
E
F
G
M
L
GAS LINE
ACCESS
N
J
K
C VENT
OPENING
L
C VENT OPENING
L
MEASURE TO TOP OF STANDOFF
HEAT
MANAGEMENT
ACCESS
(BOTH SIDES)

Heatilator • NBV30-IFT, NBV33-IFT, NBV36-IFT, NBV42-IFT Installation Manual • 2624-980 Rev. E • 10/20
10
Figure 3.2 Decorative Front Dimensions - DEMI-B
D
E
F
G
C
A
B
A B C D E F G
DEMI30-B in. 26-7/8 20-3/8 29-7/8 1-7/8 6-3/4 30 31-5/8
mm 683 518 759 48 171 762 803
DEMI33-B in. 29-7/8 20-3/8 32-7/8 1-7/8 6-3/4 30 31-5/8
mm 759 518 835 48 171 762 803
DEMI36-B in. 32-7/8 20-3/8 35-7/8 1-7/8 6-3/4 30 31-5/8
mm 835 518 911 48 171 762 803
DEMI42-B in. 38-7/8 20-3/8 41-7/8 1-7/8 6-3/4 30 31-5/8
mm 987 518 1064 48 171 762 803
DEMI-B DECORATIVE BARRIER FRONTS
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.
Note: See Section 11 for hearth, mantel and
nishing requirements.

11
Heatilator • NBV30-IFT, NBV33-IFT, NBV36-IFT, NBV42-IFT Installation Manual • 2624-980 Rev. E • 10/20
TRES-B DECORATIVE BARRIER FRONTS
A
B
C
D
E
F
G
Figure 3.3 Decorative Front Dimensions - TRES-B
A B C D E F G
TRES30-B in. 26-7/8 21 29-7/8 1-7/8 6-3/4 30 31-5/8
mm 683 533 759 48 171 762 803
TRES33-B in. 29-7/8 21 32-7/8 1-7/8 6-3/4 30 31-5/8
mm 759 533 835 48 171 762 803
TRES36-B in. 32-7/8 21 35-7/8 1-7/8 6-3/4 30 31-5/8
mm 835 533 911 48 171 762 803
TRES42-B in. 38-7/8 21 41-7/8 1-7/8 6-3/4 30 31-5/8
mm 987 533 1064 48 171 762 803
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.
Note: See Section 11 for hearth, mantel and
nishing requirements.

Heatilator • NBV30-IFT, NBV33-IFT, NBV36-IFT, NBV42-IFT Installation Manual • 2624-980 Rev. E • 10/20
12
SIMON DECORATIVE BARRIER FRONTS
A
B
C
D
E
F
G
Figure 3.4 Decorative Front Dimensions - SIMON-B
A B C D E F G
SIM-3630 in. 28-3/8 21 29-7/8 1-5/8 2-3/8 30 31-1/2
mm 721 533 759 41 60 762 800
SIM-3933 in. 31-3/8 21 32-7/8 1-5/8 2-3/8 30 31-1/2
mm 797 533 835 41 60 762 800
SIM-4236 in. 34-3/8 21 35-7/8 1-5/8 2-3/8 30 31-1/2
mm 873 533 911 41 60 762 800
SIM-4842 in. 40-3/8 21 41-7/8 1-5/8 2-3/8 30 31-1/2
mm 1026 533 1064 41 60 762 800
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.
Note: See Section 11 for hearth, mantel and
nishing requirements.

13
Heatilator • NBV30-IFT, NBV33-IFT, NBV36-IFT, NBV42-IFT Installation Manual • 2624-980 Rev. E • 10/20
Figure 3.6 Appliance Locations
A
A
A
C
B
B
1/2 in. (13 mm) min.
appliance
to combustibles
Alcove
Installation
C
D
Drywall
48 in.
(1219 mm)
max.
Refer to Section 11.B for mantel and wall
projection information.
Consider the mantel or cabinet system to be
installed and comply with the necessary
requirements for elevated hearth. Refer to
instructions included with cabinet system.
E*
* As B increases, E increases accordingly.
F
MODEL A B C D E F
NBV30-IFT in. 36 33-1/2 19-5/8 37 8-1/2 47-3/8
mm 914 851 498 940 216 1204
NBV33-IFT in. 39 35-1/2 19-5/8 40 9-1/2 50-1/4
mm 991 902 498 1016 241 1277
NBV36-IFT in. 42 37-5/8 19-5/8 43 10-5/8 53-1/4
mm 1067 956 498 1092 270 1353
NBV42-IFT in. 48 41-7/8 19-5/8 49 12-3/4 59-1/4
mm 1219 1064 498 1245 324 1505
B. Appliance Location and Clearances to
Combustibles
When selecting a location for the appliance it is important
to consider the required clearances to walls and allow suf-
cient clearance for heat management systems venting.
See Figure 3.5 and Figure 3.6.
WARNING! Risk of Fire or Burns! Provide adequate
clearance around air openings and for service access.
Due to high temperatures, the appliance should be lo-
cated out of trafc and away from furniture and draperies.
NOTICE: Illustrations reect typical installations and are
FOR DESIGN PURPOSES ONLY. Illustrations/diagrams
are not drawn to scale. Actual installation may vary due to
individual design preference.
NOTICE: Allow 18 inches minimum clearance
on side(s) of appliance for venting of heat
management system.
18 IN. MIN.
Figure 3.5 Clearance for Heat Management System

Heatilator • NBV30-IFT, NBV33-IFT, NBV36-IFT, NBV42-IFT Installation Manual • 2624-980 Rev. E • 10/20
14
Per
Manufacturer’s
Specifications
C
B
A
30 in.
(762 mm)
to ceiling
0 in.
0 in. TO LEVEL
OF STANDOFFS
1/2 in.
(13 mm)
Drywall
0 in.
1/2 in.
(13 mm)
Combustible Object
36 in.
(914 mm)
Combustible flooring may be
installed next to the front of the
appliance.
Note: Framing may be constructed
of 2 X 4 or 2 X 6 materials
* Adjust framing dimensions for interior
sheating (such as sheetrock).
Figure 3.7 Clearances to Combustibles
Note: If the inside of the framed cavity is to be nished, the framing dimensions must include the nished surface. Example: If
drywall is to be attached to the rear wall, the depth must be measured from the drywall surface.
* MINIMUM FRAMING DIMENSIONS
MODEL
A B C
Rough
Opening
(Width)
Rough
Opening
(Height)
Rough
Opening
(Depth)
NBV30-IFT in. 36 34-7/8 19-5/8
mm 914 886 498
NBV33-IFT in. 39 34-7/8 19-5/8
mm 991 886 498
NBV36-IFT in. 42 34-7/8 19-5/8
mm 1067 886 498
NBV42-IFT in. 48 34-7/8 19-5/8
mm 1219 886 498

15
Heatilator • NBV30-IFT, NBV33-IFT, NBV36-IFT, NBV42-IFT Installation Manual • 2624-980 Rev. E • 10/20
A chase is a vertical box-like structure built to enclose the
gas appliance and/or its vent system. In cooler climates
the vent should be enclosed inside the chase.
NOTICE: Treatment of ceiling restops and wall shield
restops and construction of the chase may vary with the
type of building. These instructions are not substitutes
for the requirements of local building codes. Therefore,
you MUST check local building codes to determine the
requirements to these steps.
NOTICE: When installing a sprinkler head in a replace
chase, it is recommended to use a sprinkler head with a
sprinkler activation temperature classied as Extra High.
Keep sprinkler head away from vent and chimney.
Chases should be constructed and insulated in the same
manner as the thermal envelope of the home based on
the code requirements for that climate zone to prevent air
leakage and draft problems. The chase is an extension of
the building thermal envelope.
To further prevent drafts and air leakage, the wall shield
and ceiling restops should be sealed with caulk with
a minimum of 300 ºF continuous exposure rating to
seal gaps. Gas line holes and other openings should
be sealed with caulk with a minimum of 300 ºF continu-
ous exposure rating or stuffed with unfaced insulation. If the
appliance is being installed on a cement surface, a layer of
plywood may be placed underneath to prevent conducting
cold up into the room.
NOTICE: Install appliance on hard metal or wood surfaces
extending full width and depth. DO NOT install directly on
carpeting, vinyl, or any combustible material other than
wood.
WARNING! Risk of Fire! Maintain specied air space
clearances to appliance and vent pipe:
• Insulation and other materials must be secured to prevent
accidental contact.
• The chase must be properly blocked to prevent blown
insulation or other combustibles from entering and
making contact with replace or chimney.
• Failure to maintain airspace may cause overheating and
a re.
C. Constructing the Appliance Chase

Heatilator • NBV30-IFT, NBV33-IFT, NBV36-IFT, NBV42-IFT Installation Manual • 2624-980 Rev. E • 10/20
16
A. Vent Termination Minimum Clearances
Roof Pitch H (Min.) Ft.
Flat to 6/12...........................................................1.0*
Over 6/12 to 7/12 .................................................1.25*
Over 7/12 to 8/12 .................................................1.5*
Over 8/12 to 9/12 .................................................2.0*
Over 9/12 to 10/12 ...............................................2.5*
Over 10/12 to 11/12 .............................................3.25
Over 11/12 to 12/12 .............................................4.0
Over 12/12 to 14/12 .............................................5.0
Over 14/12 to 16/12 .............................................6.0
Over 16/12 to 18/12 .............................................7.0
Over 18/12 to 20/12 .............................................7.5
Over 20/12 to 21/12 .............................................8.0
Figure 4.1 Minimum Height From Roof to Lowest Discharge
Opening
44 Termination Location and Vent Information
Fire Risk.
Maintain vent clearance to combustibles as
specied.
• DO NOT pack air space with insulation or other
materials.
Failure to keep insulation or other materials away
from vent pipe could cause overheating and re.
WARNING
VERTICAL
WALL
LISTED B-VENT
TERMINATION
CAP
12
X
ROOF PITCH
IS X/ 12
LOWEST
DISCHARGE
OPENING
H (MIN.) - MINIMUM HEIGHT FROM ROOF
TO LOWEST DISCHARGE OPENING
8 FEET
* H minimum may vary depending on regional snowfall.
Refer to local codes.
Figure 4.2 Staggered Termination Caps
Wood or Fuel Oil
Termination Cap
B
**Gas
Termination
Cap
A *
* If using decorative cap cover(s), this distance may need to be increased.
Refer to the installation instructions supplied with the decorative cap cover.
A B
6 in. (minimum) up to 20 in.
152 mm/508 mm
18 in. minimum
457 mm
20 in. and over 0 in. minimum
** If two gas terminations are present, they may be level (B = 0 inches)
provided A is a minimum of 6 inches.

17
Heatilator • NBV30-IFT, NBV33-IFT, NBV36-IFT, NBV42-IFT Installation Manual • 2624-980 Rev. E • 10/20
To replace the rst 90º starter elbow with two 45º elbows,
refer to Figure 5.1. All other 90º elbows can be replaced
with two 45º elbows.
General Rules:
• The vent system must terminate vertically.
• Vent this appliance directly outside.
• Use a separate vent system for this appliance.
• Rise to run ratio not to exceed 2:1.
• Maximum total horizontal run is 30 feet (9.1 m).
• Maximum total vertical rise is 60 feet (18.3 m).
C. Vent Diagrams
45°
Elbow
90°
Elbow
Offsets exceeding
45° adapt horizontal
limitations
Maximum
horizontal
30 ft (9.14 m)
Note: Maximum horizontal
distance is 50% of vertical
vent height.
55 Vent Information and Diagrams
A. Vent Guidelines
WARNING! Fire Risk/Asphyxiation! This appliance re-
quires the specied pipe for operation. Incorrect pipe may
cause spillage, condensation and overheating.
These models require the following size B-vent double
wall vent pipe.
B. Vent System Conguration
CAUTION! Risk of Fire! ALL vent conguration speci-
cations MUST be followed. This product is tested and listed
to these specications. Appliance performance will suffer if
specications are not followed.
Rise to Run Ratio = 2:1
Maximum Total Horizontal Run = 30 Feet
Minimum Total Vertical Rise =12 Feet
Maximum Total Vertical Rise = 60 Feet
Maximum Number of Elbows: Four 90º or Eight 45º
WARNING! Fire Risk/Explosion/Asphyxiation! DO NOT
connect this gas appliance to a chimney ue serving a
separate solid-fuel or gas burning appliance.
• Vent this appliance directly outside.
• Use separate vent system for this appliance.
May impair safe operation of this appliance or other
appliances connected to the ue.
WARNING! Risk of Fire or Explosion! Insulation and
other combustibles must not infringe on clearances.
• ALWAYS maintain specied clearances around venting
and restop systems.
• Install restops as specied.
Failure to keep insulation or other material away from vent
pipe may cause re.
Figure 5.1 Maximum Horizontal Run Using 45° Elbows
• Follow pipe manufacturer’s installation guidelines when
installing the appliance.
Model Pipe Size
NBV30-IFT/NBV33-IFT 5 in. (127 mm)
NBV36-IFT/NBV42-IFT 5 in. (127 mm)

Heatilator • NBV30-IFT, NBV33-IFT, NBV36-IFT, NBV42-IFT Installation Manual • 2624-980 Rev. E • 10/20
18
No Elbow
Figure 5.2
Figure 5.3
Two Elbows
VTotal = 60 ft (18.3 m) Maximum
VTotal = 12 ft (3.7 m) Minimum
Maximum horizontal run is 50% of vertical, but may not exceed
30 ft. (9.1 m) METAL
PLUMBERS' STRAP
VENT SUPPORTS
ARE PER VENT
MANUFACTURER'S
SPECIFICATIONS.
V = 60 ft. (18.3 m) Maximum
V = 12 ft. (3.7 m) Minimum

19
Heatilator • NBV30-IFT, NBV33-IFT, NBV36-IFT, NBV42-IFT Installation Manual • 2624-980 Rev. E • 10/20
Figure 5.4
Three Elbows
INSTALLED
HORIZONTALLY
VTOTAL = 60 ft. (18.3 m) Maximum
VTOTAL = 12 ft. (3.7 m) Minimum
Maximum horizontal run is 50% of vertical, but may not
exceed 30 ft. (9.1 m)

Heatilator • NBV30-IFT, NBV33-IFT, NBV36-IFT, NBV42-IFT Installation Manual • 2624-980 Rev. E • 10/20
20
Top Vent - Vertical Termination - (continued)
Four Elbows
VTOTAL= 60 ft. (18.3 m) Maximum
VTOTAL = 12 ft. (3.7 m) Minimum
Maximum horizontal run is 50% of vertical, but may not
exceed 30 ft. (9.1 m)
Figure 5.5