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4 USSC
FIGURE 1 -
MASONRY CHIMNEY
REQUIREMENTS
FLUE
MINIMUM 1/2" AIR SPACE
FOUNDATION
CHIMNEY WALL 4"
NOMINAL
5/8" FIRECLAY OR
STAINLESS STEAL
FLUE LINER
If the heater is to be connected to a masonry chimney, the heater should not be installed until it is determined that the
chimney is safe for use. Before installing the heater, have the chimney inspected by a building inspector, fire department,
or qualified heating engineer. To prevent risk of walls, roof, or other combustibles catching fire from the extremely hot fire,
smoke, and flue gases, and to obtain a proper draw, a chimney must meet the minimum standards for masonry chimneys
established by the National Fire Protection Association (NFPA). Make certain the inspection agency is familiar with NFPA
No. 211 and all local codes. Some of those minimum standards are listed here for your convenience.
1. The chimney must not be obstructed or clogged. An obstructed or clogged chimney could cause smoke and the
dangerous carbon monoxide in smoke to spill back into your home.
2. Your masonry chimney must be supported on an adequate foundation and must have either a 5/8" thick fireclay or
stainless steel lining. There must be at least 1/2-inch air space between the flue liner and the chimney wall. (See Figure 1.)
3. A chimney inside the house must have at least 2 inches of clearance to the combustible structure. A chimney outside
the house must have at least 1 inch clearance to the combustible structure. Fire stops must be installed at the spaces
where the chimney passes through floors and/or ceilings. (See Figure 2.) Insulation should be at least 2 inches from the
chimney to leave an air space around the chimney. (See Figure 3.)
4. The flue lining of a masonry chimney must be smooth and
have no leaks. The inside of the chimney flue liner should be no
smaller than 8 inches square or 6 inches round; a smaller chim-
ney flue liner will be too restrictive to the flow of smoke and
gases. A 6 inch diameter round liner is preferred because round
flues draw better than square flues.
5. Since an oversized chimney flue contributes to the accumu-
lation of creosote, the size of the chimney flue liner must be
checked to determine that it is not too large for the heater. For
this heater, the inside cross-sectional area of the chimney should
be no more than 85 square inches to assure proper venting.
6. The top of the chimney must be at least 3 feet above the
point where it comes through the roof, and at least 2 feet higher
than any obstruction within a 10 foot radius.(See Figure 4.)
7. If the heater has insufficient draft, the draft may be improved
by extending the height of the chimney.
8. Make certain the chimney is kept clean and it is not blocked.
Check for limbs overhanging the top of the chimney periodically.
MASONRY CHIMNEY REQUIREMENTS
1. When locating the heater , consider safety, convenience, traffic flow, and the fact that the heater will need a
chimney,chimney connector,and possibly a floor protector. Make sure none of these materials will be obstructed.
2. The heater should be located away from door ways and central heat outlets to reduce the chances of drafts, blowing
smoke, ashes or sparks out of the heater during refueling or ash removal.
3. The heater should be located in an open area to allow for necessary clearances as specified within this manual.
4. Keep furniture, drapes, curtains, wood, paper and other combustibles far away from the heater.
5. Never install the heater in locations where gasoline, kerosene, charcoal lighter, or any other flammable liquids are
stored
6. The heater should be located where a small supply of wood may be kept conveniently close but not within 36-inches of
the heater.
7. The heater should not be located beneath overhanging shelves, low ceilings or other structures or elevated so that less
clearance is created above the heater than is provided when the heater is normally installed in a room with a 7 foot
minimum ceiling.
8. Be sure the chimney will be at least 10 feet from flammable gas or liquid storage tanks.
DANGER: DO NOT CONNECT THIS HEATER TO A CHIMNEY FLUE SERVING ANOTHER APPLIANCE. THERE IS A
SERIOUS SAFETY RISK IF TWO APPLIANCES ARE CONNECTED TO THE SAME CHIMNEY FLUE.
CAUTION: The operation of exhuast fans such as bath room fans, attic fans, etc. might starve the heater of combustible
air creating a negative pressure in the room. Provide adequate ventilation in the room occompaning the heater.
SELECTING A LOCATION FOR YOUR HEATER