Heatilator • NNXT4236IF, NNXT4236ILF, NNXT3633IF, NNXT3633ILF Installation Manual • 4055-980 Rev. D • 9/15
4
C. BTU Speci
fi
cations
E. Non-Combustible Materials Speci
fi
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
fi
cation
Materials made of or surfaced with wood, compressed pa-
per, plant
fi
bers, plastics, or other material that can ignite
and burn, whether
fl
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.
1
1
Product Speci
fi
c 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 certi
fi
ed 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
ori
fi
ce size.
A. Appliance Certi
fi
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.
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
fi
cations (Ceramic)
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.
Installation and service of this appliance should be
performed by quali
fi
ed personnel. Hearth & Home
Technologies suggests NFI certi
fi
ed or factory
trained professionals, or technicians supervised by
an NFI certi
fi
ed professional (www.n
fi
certi
fi
ed.org).
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”.
MODELS:
NNXT4236IF, NNXT4236ILF, NNXT3933IF,
NNXT3933ILF
LABORATORY:
Underwriters Laboratories, Inc. (UL)
TYPE:
Direct Vent Heater
STANDARD:
ANSI Z21.88-2014/CSA 2.33-2014
Models
(U.S. or Canada)
Maximum
Input BTU/h
Minimum
Input
BTU/h
Ori
fi
ce
Size
NNXT4236IF
(NG)
(0-2000 FT)
31,000
18,500
#37 DMS
NNXT4236ILF
(Propane)
(0-2000 FT)
30,000
17,000
#52 DMS
NNXT3933IF
(NG)
(0-2000 FT)
29,000
16,000
#39 DMS
NNXT3933ILF
(Propane)
(0-2000 FT)
27,500
15,750
1.55 mm
