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Product Specific and Important Safety Information
A. Appliance Certification
MODELS: NNXT33-IFT, NNXT33L-IFT, NNXT36-IFT,
NNXT36L-IFT
LABORATORY: Underwriters Laboratories, Inc. (UL)
TYPE: Direct Vent Heater
STANDARD: CSA / ANSI Z21.88:19 • CSA 2.33:19
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".
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.
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.
B. Glass Specifications
This appliance is equipped with 5 mm ceramic glass. Re-
place glass only with 5 mm ceramic glass. Please contact
your dealer for replacement glass.
C. BTU Specifications
Models
(U.S. or Canada)
NNXT33-IFT
(0-2000 FT)
(NG)
NNXT33L-IFT
(0-2000 FT)
(Propane)
NNXT36-IFT
(0-2000 FT)
(NG)
NNXT36L-IFT
(0-2000 FT)
(Propane)
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Heatilator • NNXT33-IFT, NNXT33L-IFT, NNXT36-IFT, NNXT36L-IFT Installation Manual • 2628-980 Rev. C • 8/20
Minimum
Maximum
Orifice
Input
Input BTU/h
Size
BTU/h
29,000
16,000
#39
28,000
15,750
1.55 mm
31,000
18,500
#37
29,000
15,500
#52
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.
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.
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.
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