Heatilator NBV3630I-B User manual

1
Heatilator • NBV3630I-B, NBV3933I-B, NBV4236I-B, NBV4842I-B Installation Manual • 2376-980 Rev. F • 7/16
Installation Manual
Installation and Appliance Setup
INSTALLER: Leave this manual with party responsible for use and operation.
OWNER: Retain this manual for future reference.
NOTICE: DO NOT discard this manual!
• DO NOT store or use gasoline or other flam-
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 fire department.
• Installation and service must be performed
by a qualified 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):
NBV3630I-B
NBV3933I-B
NBV4236I-B
NBV4842I-B
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 shall be installed for
the protection of children and other at-risk
individuals.
In the Commonwealth of Massachusetts installation must be
performed by a licensed plumber or gas fitter.
A CO detector shall be installed in the room where the appliance
in installed.

Heatilator • NBV3630I-B, NBV3933I-B, NBV4236I-B, NBV4842I-B Installation Manual • 2376-980 Rev. F • 7/16
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.
Table of Contents
Installation Standard Work Checklist. . . . . . . . . . . . . . . . . . . . 3
1 Product Specific and Important Safety Information
A. Appliance Certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
B. Glass Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
C. BTU Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
D. High Altitude Installations . . . . . . . . . . . . . . . . . . . . . . . . . . 4
E. Non-Combustible Materials Specification. . . . . . . . . . . . . . 5
F. Combustible Materials Specification . . . . . . . . . . . . . . . . . 5
G. Electrical Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Getting Started
A. Design and Installation Considerations . . . . . . . . . . . . . . . 6
B. Tools and Supplies Needed . . . . . . . . . . . . . . . . . . . . . . . . 6
C. Inspect Appliance and Components. . . . . . . . . . . . . . . . . . 6
D. Negative Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3 Framing and Clearances
A. Appliance/Decorative Front Dimension Diagrams . . . . . . . 8
B. Clearances to Combustibles . . . . . . . . . . . . . . . . . . . . . . 13
C. Constructing the Appliance Chase . . . . . . . . . . . . . . . . . . 15
D. Hearth Extension/Floor Protection . . . . . . . . . . . . . . . . . . 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 Configuration. . . . . . . . . . . . . . . . . . . . . . . . 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
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. . . . . . . . . . . . . . . . . . . . . . . 30
C. Decorative Front Dimensions for Finishing . . . . . . . . . . . 30
12 Appliance Setup
A. Remove Fixed Glass Assembly . . . . . . . . . . . . . . . . . . . . 31
B. Remove the Shipping Materials . . . . . . . . . . . . . . . . . . . . 31
C. Clean the Appliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
D. Install Optional Refractory Kit. . . . . . . . . . . . . . . . . . . . . . 31
E. Install the Log Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . 32
F. Place the Mineral Wool . . . . . . . . . . . . . . . . . . . . . . . . . . 34
G. Place the Lava Rock . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
H. Place the Vermiculite . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
I. Install Fixed Glass Assembly . . . . . . . . . . . . . . . . . . . . . . 34
J. Install Decorative Front . . . . . . . . . . . . . . . . . . . . . . . . . . 34
13 Reference Materials
A. Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
= Contains updated information.



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Heatilator • NBV3630I-B, NBV3933I-B, NBV4236I-B, NBV4842I-B Installation Manual • 2376-980 Rev. F • 7/16
Installation Standard Work Checklist
Customer:
Lot/Address:
Model (circle one): NBV3630I-B NBV4236I-B
NBV3933I-B NBV4842I-B
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 Àashing 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 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. ___________________________
2376-982 Rev. B 7/16
Î= 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


Heatilator • NBV3630I-B, NBV3933I-B, NBV4236I-B, NBV4842I-B Installation Manual • 2376-980 Rev. F • 7/16
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B. Glass Specifications
Hearth & Home Technologies appliances manufactured
with tempered glass may be installed in hazardous lo-
cations such as bathtub enclosures as defined by the
Consumer Product Safety Commission (CPSC). The
tempered glass has been tested and certified to the re-
quirements of ANSI Z97.1 and CPSC 16 CFR 1202
(Safety Glazing Certification 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 “Certification and labeling requirements”
which refers to 15 U.S. Code (USC) 2063 stating “…Such
certificate 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 Specifications
MODELS: NBV3630I-B, NBV3933I-B,
NBV4236I-B, NBV4842I-B
LABORATORY: Underwriters Laboratories, Inc. (UL)
TYPE: Vented Gas Fireplaces
STANDARD: ANSI Z21.88-2014/CSA 2.33-2014
A. Appliance Certification
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.
1
1 Product Specific and Important Safety Information
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 certified without a reduction
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
orifice size.
Models
(U.S. or Canada)
Maximum
Input
BTU/h
Minimum
Input
BTU/h
Orifice
Size
(DMS)
NBV3630I-B (NG) (0-2000 FT) 20,000 14,000 .083 in.
NBV3630I-B (LP) (0-2000 FT) 17,000 14,000 .053 in.
NBV3933I-B (NG) 0-2000 FT) 22,000 15,000 #43
NBV3933I-B (LP) 0-2000 FT) 22,000 15,000 #54
NBV4236I-B (NG) 0-2000 FT) 25,000 17,000 #42
NBV4236I-B (LP) 0-2000 FT) 25,000 17,000 .058 in.
NBV4842I-B (NG) 0-2000 FT) 30,000 20,500 #37
NBV4842I-B (LP) 0-2000 FT) 30,000 22,500 #52
This product is listed to ANSI standards for “Vented Gas
Fireplaces” and “Gas Fired Appliances for Use at High
Altitudes”.
May be installed in a sleeping room when the provisions
for combustion, ventilation and dilution air are met per the
requirements of ANSI 223.1/NFPA 54 National Fuel Gas
Code. In Canada, installation in a sleeping room requires
installation with a thermostat certified for use with this prod-
uct. Consult your local authorities having jurisdiction.
NOTICE: This installation must conform with local codes
or, in the absence of local codes, with the National Fuel
Gas Code, ANSI Z223.1/NFPA 54, or the Natural Gas and
Propane Installation Code, CSA B149.1.

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Heatilator • NBV3630I-B, NBV3933I-B, NBV4236I-B, NBV4842I-B Installation Manual • 2376-980 Rev. F • 7/16
E. Non-Combustible Materials Specification
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 Specification
Materials made of or surfaced with wood, compressed pa-
per, plant fibers, plastics, or other material that can ignite
and burn, whether flame 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.

Heatilator • NBV3630I-B, NBV3933I-B, NBV4236I-B, NBV4842I-B Installation Manual • 2376-980 Rev. F • 7/16
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2
2 Getting Started
A. Design and Installation Considerations
Heatilator B-type vent gas appliances are designed to
operate with all exhaust gases expelled to the outside of
the building, and combustion air pulled from the room.
Installation MUST comply with local, regional, state and
national codes and regulations. Consult insurance carrier,
local building inspector, fire officials 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 configuration to be used.
• Gas supply piping requirements.
• Electrical wiring requirements.
• Framing and finishing details.
• Whether optional accessories—devices such as a fan,
wall switch, or remote control—are desired.
B. Tools and Supplies Needed
Before beginning the installation be sure that the following
tools and building supplies are available.
Tape measure Framing material
Pliers Hammer
Phillips screwdriver Manometer
Gloves Framing square
Voltmeter Electric drill and bits (1/4 in.)
Plumb line Safety glasses
Level Reciprocating saw
Flat blade screwdriver
Non-corrosive leak check solution
1/2 - 3/4 in. length, #6 or #8 Self-drilling screws
Caulking material (300ºF minimum continuous exposure
rating)
One 1/4 in. female connection (for optional fan).
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.
• Modification 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 fire hazard.
WARNING! Risk of Fire, Explosion or Electric Shock!
DO NOT use this appliance if any part has been under
water. Call a qualified service technician to inspect the
appliance and to replace any part of the control system
and/or gas control which has been under water.
Improper installation, adjustment, alteration, service or
maintenance can cause injury or property damage. For
assistance or additional information, consult a qualified
service technician, service agency or your dealer.
C. Inspect Appliance and Components
The following B-vent components are needed for instal-
lation.
• Fireplace Box
• Pipe Components
• Firestops
• Attic Insulation Shield
• Elbows
• Strapping
• Roof Flashing or Chase Top
• Termination Cap
• Storm Collar
• Carefully remove the appliance and components from
the packaging.
• The vent system components and decorative doors
and 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,
particularly the condition of the glass.
• Read all of the instructions before starting the
installation. Follow these instructions carefully during
the installation to ensure maximum safety and benefit.
WARNING! Risk of Fire or Explosion! Damaged parts
could impair safe operation. DO NOT install damaged, in-
complete or substitute components. Keep appliance dry.
Installation and service of this
appliance should be performed by
qualified personnel. Hearth & Home
Technologies recommends HHT
Factory Trained or NFI certified
professionals.

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Heatilator • NBV3630I-B, NBV3933I-B, NBV4236I-B, NBV4842I-B Installation Manual • 2376-980 Rev. F • 7/16
Recommended
Location
Marginal
Location
Location
Not
Recommended
Recommended
Location
Multi-level Roofs
Windward
Leeward
Location
Not
Recommended
Figure 4.2
D. 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 fireplaces
successfully. Considerations for successful draft include:
• Preventing negative pressure
• Location of fireplace and chimney
Negative pressure results from the imbalance of air
available for the fireplace 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 fireplace.
• Avoid installing the fireplace 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 fireplaces in basements.
Location of the fireplace and chimney will affect perfor-
mance. As shown in Figure 4.2, 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 fire.
• 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 fireplace location relative to floor
and ceiling and attic joists.

Heatilator • NBV3630I-B, NBV3933I-B, NBV4236I-B, NBV4842I-B Installation Manual • 2376-980 Rev. F • 7/16
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3
3 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 - NBV3630I-B, NBV3933I-B
NBV3630I-B NBV3933I-B
Location Inches Millimeters Inches Millimeters
A35 889 38 965
B30 762 33 838
C6-3/8 162 6-3/8 162
D19-7/8 505 19-7/8 505
E26-5/8 676 29-5/8 752
F31-1/2 800 31-1/2 800
G35-1/4 895 35-1/4 895
H15-3/4 400 15-3/4 400
I1-3/4 44 1-3/4 44
J376 3 76
K6-1/2 165 mm 6-1/2 165 mm
L34-1/2 876 34-1/2 876
M8-5/8 219 11-5/8 295
N4-3/8 111 5-7/8 149
O11-5/8 295 11-5/8 295
P19-1/8 486 19-1/8 486
Q2-3/8 60 2-3/8 60
R8 203 8 203
P
O
M
N
L
GAS LINE
ACCESS
J
K
C
D
B
A
FG
E
R
I
HALTERNATE
GAS ACCESS
Q
C VENT
OPENING
L
C VENT OPENING
L
MEASURE TO TOP OF STANDOFF

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Heatilator • NBV3630I-B, NBV3933I-B, NBV4236I-B, NBV4842I-B Installation Manual • 2376-980 Rev. F • 7/16
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
NBV4236I-B NBV4842I-B
Location Inches Millimeters Inches Millimeters
A41 1041 47 1194
B36 916 42 1067
C6-3/8 162 6-3/8 162
D19-7/8 505 19-7/8 505
E32-5/8 829 38-5/8 981
F31-1/2 800 31-1/2 800
G35-1/4 895 35-1/4 895
H15-3/4 400 15-3/4 400
I1-3/4 44 1-3/4 44
J376376
K6-1/2 165 6-1/2 165
L34-1/2 876 34-1/2 876
M14-5/8 372 20-5/8 524
N7-3/8 187 10-3/8 264
O11-5/8 295 11-5/8 295
P19-1/8 486 19-1/8 486
Q2-3/8 60 2-3/8 60
R8 203 8 203
Figure 3.2 Appliance Dimensions - NBV4236I-B, NBV4842I-B

Heatilator • NBV3630I-B, NBV3933I-B, NBV4236I-B, NBV4842I-B Installation Manual • 2376-980 Rev. F • 7/16
10
Figure 3.3 Decorative Front Dimensions - DEMI-B
DEMI-B DECORATIVE FRONTS
D
E
F
G
C
A
B
ABCDEFG
DEMI-3630-B in. 26-7/8 20-3/8 29-7/8 1-7/8 6-3/4 30 31-7/8
mm 683 518 759 48 171 762 810
DEMI-3933-B in. 29-7/8 20-3/8 32-7/8 1-7/8 6-3/4 30 31-7/8
mm 759 518 835 48 171 762 810
DEMI-4236-B in. 32-7/8 20-3/8 35-7/8 1-7/8 6-3/4 30 31-7/8
mm 835 518 911 48 171 762 810
DEMI-4842-B in. 38-7/8 20-3/8 41-7/8 1-7/8 6-3/4 30 31-7/8
mm 987 518 1064 48 171 762 810

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Heatilator • NBV3630I-B, NBV3933I-B, NBV4236I-B, NBV4842I-B Installation Manual • 2376-980 Rev. F • 7/16
TRES-B DECORATIVE FRONTS
A
B
C
D
E
F
G
Figure 3.4 Decorative Front Dimensions - TRES-B
AB C D E F G
TRES-3630-B in. 26-7/8 19-7/8 29-7/8 1-7/8 6-3/4 30 31-7/8
mm 683 505 759 48 171 762 810
TRES-3933-B in. 29-7/8 19-7/8 32-7/8 1-7/8 6-3/4 30 31-7/8
mm 759 505 835 48 171 762 810
TRES-4236-B in. 32-7/8 19-7/8 35-7/8 1-7/8 6-3/4 30 31-7/8
mm 835 505 911 48 171 762 810
TRES-4842-B in. 38-7/8 19-7/8 41-7/8 1-7/8 6-3/4 30 31-7/8
mm 987 505 1064 48 171 762 810

Heatilator • NBV3630I-B, NBV3933I-B, NBV4236I-B, NBV4842I-B Installation Manual • 2376-980 Rev. F • 7/16
12
SIMON DECORATIVE FRONTS
A
B
C
D
E
F
G
Figure 3.5 Decorative Front Dimensions - SIMON-B
ABC DEFG
SIM-3630 in. 28-3/8 21 29-7/8 1-5/8 6-3/4 28 29-5/8
mm 721 533 759 41 171 711 753
SIM-3933 in. 31-3/8 21 32-7/8 1-5/8 6-3/4 28 29-5/8
mm 797 533 835 41 171 711 753
SIM-4236 in. 34-3/8 21 35-7/8 1-5/8 6-3/4 28 29-5/8
mm 873 533 911 41 171 711 753
SIM-4842 in. 40-3/8 21 41-7/8 1-5/8 6-3/4 28 29-5/8
mm 1026 533 1064 41 171 711 753

13
Heatilator • NBV3630I-B, NBV3933I-B, NBV4236I-B, NBV4842I-B Installation Manual • 2376-980 Rev. F • 7/16
B. Clearances to Combustibles
When selecting a location for the appliance it is important
to consider the required clearances to walls (see 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 traffic and away from furniture and draperies.
NOTICE: Illustrations reflect typical installations and are
FOR DESIGN PURPOSES ONLY. Illustrations/diagrams
are not drawn to scale. Actual installation may vary due to
individual design preference.
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.
ABCD
inches 36 33-1/2 19-5/8 37
mm 914 851 498 940
inches 39 35-1/2 19-5/8 40
mm 991 902 498 1016
inches 42 37-5/8 19-5/8 43
mm 1067 956 498 1092
inches 48 41-7/8 19-5/8 49
mm 1219 1064 498 1245
NBV4842I-B
Model
NBV3630I-B
NBV3933I-B
NBV4236I-B
E*
* As B increases, E increases accordingly.
E
8-1/2
9-1/2
10-5/8
12-3/4
216
241
270
324

Heatilator • NBV3630I-B, NBV3933I-B, NBV4236I-B, NBV4842I-B Installation Manual • 2376-980 Rev. F • 7/16
14
Per
Manufacturer’s
Specifications
C
B
A
32-1/2 in.
(826 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
Figure 3.7 Clearances to Combustibles
Note: If the inside of the framed cavity is to be finished, the framing dimensions must include the finished 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
ABC
Rough
Opening
(Width)
Rough
Opening
(Height)
Rough
Opening
(Depth)
NBV3630I-B in. 36 34-7/8 19-5/8
mm 914 886 498
NBV3933I-B in. 39 34-7/8 19-5/8
mm 991 886 498
NBV4236I-B in. 42 34-7/8 19-5/8
mm 1067 886 498
NBV4842I-B in. 48 34-7/8 19-5/8
mm 1219 886 498

15
Heatilator • NBV3630I-B, NBV3933I-B, NBV4236I-B, NBV4842I-B Installation Manual • 2376-980 Rev. F • 7/16
C. Constructing the Appliance Chase
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 firestops and wall shield
firestops 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.
Chases should be constructed in the manner of all out-
side walls of the home to prevent cold air drafting prob-
lems. The chase should not break the outside building
envelope in any manner.
Walls, ceiling, base plate and cantilever floor of the chase
should be insulated. Vapor and air infiltration barriers
should be installed in the chase as per regional codes for
the rest of the home. Additionally, in regions where cold
air infiltration may be an issue, the inside surfaces may be
sheetrocked and taped (or an equivalent method may be
used) to achieve maximum air tightness.
To further prevent drafts, the wall shield and ceiling fire-
stops should be caulked with caulk with a minimum of
300ºF continuous exposure rating to seal gaps. Gas
line holes and other openings should be caulked with
caulk with a minimum of 300ºF continuous 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, tile or any combustible material other
than wood.
WARNING! Risk of Fire! Maintain specified 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 fireplace or chimney.
• Failure to maintain airspace may cause overheating and
a fire.
D. Hearth Extension/Floor Protection
WARNING! Risk of Fire! Hearth extension required to
protect combustible floors in front of appliance.
Elevated Hearth Systems
Some hearth systems will elevate the appliance off the
floor at a given dimension. The elevation will also have
to be added to the rough opening height (header height)
referenced in Figure 3.7. Note: Finished floor thickness
should also be considered when determining installation
dimensions.

Heatilator • NBV3630I-B, NBV3933I-B, NBV4236I-B, NBV4842I-B Installation Manual • 2376-980 Rev. F • 7/16
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
4
4 Termination Location and Vent Information
Fire Risk.
Maintain vent clearance to combustibles as
specified.
• 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 fire.
WARNING
Figure 4.2 Staggered Termination Caps
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
Gas, 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.
**
AB
6 in. (minimum) up to 20 in.
152 mm/508 mm
18 in. minimum
457 mm
20 in. and over 0 in. minimum
In a staggered installation with both gas and wood or fuel oil
terminations, the wood or fuel oil termination cap must be
higher than the gas termination cap.
C
C= 8 in. (203 mm) recommended
* H minimum may vary depending on regional snowfall.
Refer to local codes.

17
Heatilator • NBV3630I-B, NBV3933I-B, NBV4236I-B, NBV4842I-B Installation Manual • 2376-980 Rev. F • 7/16
To replace the first 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.
5
5 Vent Information and Diagrams
A. Vent Guidelines
WARNING! Fire Risk/Asphyxiation! This appliance re-
quires the specified 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 Configuration
CAUTION! Risk of Fire! ALL vent configuration specifi-
cations MUST be followed. This product is tested and listed
to these specifications. Appliance performance will suffer if
specifications 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 flue 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 flue.
WARNING! Risk of Fire or Explosion! Insulation and
other combustibles must not infringe on clearances.
• ALWAYS maintain specified clearances around venting
and firestop systems.
• Install firestops as specified.
Failure to keep insulation or other material away from vent
pipe may cause fire.
Figure 5.1 Maximum Horizontal Run Using 45° Elbows
• Follow pipe manufacturer’s installation guidelines when
installing the appliance.
Model Pipe Size
NBV3630I-B/NBV3933I-B 5 in. (127 mm)
NBV4236I-B/NBV4842I-B 5 in. (127 mm)

Heatilator • NBV3630I-B, NBV3933I-B, NBV4236I-B, NBV4842I-B Installation Manual • 2376-980 Rev. F • 7/16
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 • NBV3630I-B, NBV3933I-B, NBV4236I-B, NBV4842I-B Installation Manual • 2376-980 Rev. F • 7/16
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 • NBV3630I-B, NBV3933I-B, NBV4236I-B, NBV4842I-B Installation Manual • 2376-980 Rev. F • 7/16
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