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Product Specific Information
A. Firebox Certification
MODELS: VOFB36-T, VOFB36-H, VOFB42-T, VOFV42-H
LABORATORY: Underwriters Laboratories, Inc. (UL)
TYPE: Ventless Firebox Enclosures for Gas-Fired
Unvented Gas Log Type Room Heaters
STANDARD: CSA/ANSI Z21.91:20
Indoor Use: The installed gas appliance must be listed in
accordance with CSA/ANSI Z21.11.2:19 gas fired unvented
room heaters not to exceed 40,000 BTU/hr(11723 W)
Outdoor Use: The installed gas appliance must be listed
in accordance with CSA/ANSI Z21.97 2017 Outdoor
decorative appliance and CSA/ANSI Z21.11.2:19 Unvented
room heater not to exceed 40,000 BTU/hr (11,723 W)
This product is listed to ANSI standards for "Ventless Gas
Firebox Enclosures for Gas-Fired Unvented Gas Log
Type Room Heaters".
The Vesper series gas appliance is designed for outdoor
use and may be installed as a stand alone unit or built into
a wall.
Outdoor spaces - For the purpose of these instructions,
an appliance is considered to be outdoors if installed with
shelter no more inclusive than:
1. With walls on all sides, but no overhead cover
2. Within a partial enclosure which includes an overhead
cover and no more than two side walls. These side
walls may be parallel, as in a breezeway, or at right
angles to each other; or
3. Within a partial enclosure which includes an overhead
cover and three sidewalls, as long as 30% or more
of the horizontal periphery of the enclosure is perma-
nently open.
NOTE: Screen may be used on the open sides of the
shelter. 14x18 and 16x18 screen mesh is approved for
use. DO NOT use solar screen or no-see-um screen.
If appliance does not meet the above requirements, it
must have a Z21.11.2 Unvented Heater installed.
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/NFPA 54.
6
Outdoor Lifestyles • VOFB36/42 Owner's Manual • 4153-900 • Rev A • 02/23
Note:
Smoke, carbon monoxide or combination alarms
Alarm manufacturers recommend that alarms be kept at
least 15 ft. to 20 ft. laterally away from fuel-burning sources.
Installing the alarm closer than 15 ft. will not harm the
alarm, but may increase the frequency of nuisance alarms.
Mounting alarms on the wall versus the ceiling will further
reduce nuisance alarms.
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.
Installation and service of this appliance should
be performed by qualified personnel. Hearth
& Home Technologies recommends HHT
Factory Trained or NFI certified professionals.
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.
B. BTU Specifications
This product is for use ONLY with a listed decorative
"Gas-Fired Unvented Decorative Room Heaters".
Model(s)
VOFB36-T/H
(0-2000 FT)
VOFB42-T/H
(0-2000 FT)
Altitude
Maximum
Allowable
BTU/hr
40,000
40,000
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