PROPER BURN PRACTICES
FOR MAXIMUM EFFICIENCY AND SAFETY!
• The chimney is one of the most important elements of the furnace. If the chimney is not
connected properly and installed according to manufacturer’s specification and national and
local codes, the unit is not safe and will not burn efficiently. Lack of proper chimney installation
will cause unit to produce more smoke and less heat output. See Pages 5-10 of this manual to
ensure proper installation.
• Proper use of all electrical components is essential. The wall thermostat must be hooked up to
the furnace and located within the heated area of the home.
• To maximize the performance of the furnace, the draft blower may not be adjusted or altered in
any manner.
• Wood that is properly cut and stored to dry will produce more BTUs and higher heat output
than wood that has a higher moisture content. Wood with higher moisture content will create
creosote in the chimney and cause flue fires.
• There should be no alteration of the Shelter furnace in any way, as this will void the UL391 safety
listing and affect the operation of the furnace. This will also void the warranty of the unit.
• Shelter makes two types of units, indoor as well as outdoor furnaces. The indoor units are
manufactured and tested for indoor applications only. They are not meant to go outside the
house but must be placed indoors in a basement or utility room. Any indoor unit placed
outside the home in a shed or building will void warranty, violate the safety listing, and will not
produce the maximum efficiency possible with this unit. For outdoor applications please use
model SF4200.
• Indoor units many not be installed in mobile homes.
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