Monessen Hearth GCUF Series User Manual

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9.   The installation must conform with local codes or, in 

the absence of local codes, with the National Fuel Gas 
Code, ANSI Z223.l/NFPA54.

10. This unit complies with ANSI Z21.91 ventless firebox 

enclosures for gas-fired unvented decorative room heat-
ers.

11.  Do not install heater in a bathroom or bedroom.
12.  Correct installation of the ceramic fiber logs, proper 

location of the heater, and annual cleaning are necessary 
to avoid potential problems with sooting. Sooting, 
resulting from improper installation or operation, 
can settle on surfaces outside the fireplace. See log 
placement instructions for proper installation.

13.  Avoid any drafts that alter burner flame patterns. Do not 

allow fans to blow directly into fireplace. Do not place 
a blower inside burn area of firebox. Ceiling fans may 
create drafts that alter burner flame patterns. Sooting 
and improper burning will occur.

14.  Caution: Candles, incense, oil lamps, etc. produce 

combustion byproducts including soot. Vent-free appli-
ances will not filter or clean soot produced by these types 
of products. In addition, the smoke and/or aromatics 
(scents) may be reburnt in the vent-free appliance which 
can produce odors. It is recommended to minimize the 
use of candles, incense, etc. while the vent-free appliance 
is in operation. 

15.  An unvented gas-fired heater uses air (oxygen) from the 

room in which it is installed. Provisions for adequate 
combustion and ventilation air must be provided. See 
installation guidelines. 

INSTALLER
Please leave these instructions with the appliance.

OWNER
Please retain these instructions for future reference.

Read these instructions carefully before installing or trying to operate a vent-free gas heater in this fi rebox. 

  1. Due to high temperatures, the appliance should 

be located out of traffic and away from furniture 
and draperies.

  2.  Children and adults should be alerted to the hazard 

of high surface temperature and should stay away 
to avoid burns or clothing ignition.

  3. Young children should be carefully supervised 

when they are in the same room with the appli-
ance. 

  4.  Do not place clothing or other flammable material 

on or near the appliance. 

  5.  Any safety screen or guard removed for servicing 

an appliance, must be replaced prior to operating 
the heater.

  6.  Installation and repair should be done by a qualified 

service person.

  7.  To prevent malfunction and/or sooting, an unvented 

gas heater should be cleaned before use at least 
annually by a professional service person. More 
frequent cleaning may be required due to exces-
sive lint from carpeting, bedding material, etc. It is 
imperative that control compartments, burners and 
circulating air passageways be kept clean.

8.   CARBON MONOXIDE POISONING: Early signs of 

carbon monoxide poisoning are similar to the flu with 
headaches, dizziness and/or nausea. If you have these 
signs, obtain fresh air immediately. Have the heater 
serviced as it may not be operating properly.