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Heatilator • NNXT4236IF-B, NNXT4236ILF-B, NNXT3933IF-B, NNXT3933ILF- B Owner’s Manual • 2384-981 Rev. G • 6/18
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.
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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Product Specific Information
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.
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”.
C. BTU Specifications
Models
(U.S. or Canada)
Maximum
Input BTU/h
Minimum
Input
BTU/h
Orifice
Size
NNXT3933IF-B
(NG)
(0-2000 FT)
29,000
16,000
#39 DMS
NNXT3933ILF-B
(Propane)
(0-2000 FT)
28,000
15,750
1.55 mm
NNXT4236IF-B
(NG)
(0-2000 FT)
31,000
18,500
#37 DMS
NNXT4236ILF-B
(Propane)
(0-2000 FT)
29,000
15,500
#52 DMS
Installation and service of this appliance should be performed by
qualified personnel. Hearth & Home Technologies recommends
HHT Factory Trained or NFI certified professionals.
MODELS:
NNXT4236IF-B, NNXT4236ILF-B,
NNXT3933IF-B, NNXT3933ILF-B
LABORATORY:
Underwriters Laboratories, Inc. (UL)
TYPE:
Direct Vent Heater
STANDARD:
ANSI Z21.88-2017 • CSA 2.33-2017