6
CHIMNEY REQUIREMENTS
A fireclay lined masonry or Class A 103HT All-Fuel Metal Insulated
Chimney must be used in all airtight wood furnace installations. The
minimum recommended flue size for the model AAF747 is 6 inches,
inside diameter. When making new chimney installations, always fol
-
low the chimney manufacturer’s instructions.
If at all possible, use the factory built, class A 103HT chimney men
-
tioned above. They are safer and perform better than traditional ma
-
sonry chimneys. If a masonry chimney is a must, be certain it has a
fire clay liner and that it is intact, clean and recently inspected. And
remember, masonry chimneys are far more prone to the formation of
hazardous creosote.
1. The furnace should be the only heating using the chimney flue
. One furnace per flue outlet.
TOP OF CHIMNEY MUST BE
2 FEET [61cm] ABOVE
HIGHEST POINT OF THE
ROOF WITHIN 10 FEET
[305cm].
2 FT [61cm]
MINIMUM
3 FT [91cm]
MINIMUM
RECOMMENDED
MINIMUM HEIGHT
20 FT [610cm]
MINIMUM 3 FT[91cm] FROM
TOP OF CHIMNEY TO
POINT AT WHICH IT
PASSES THROUGH THE
ROOF.
2. A masonry chimney should have a tile or stainless steel liner.
3. The masonry chimney should not have any missing mortar or
loose bricks.
4. There should be no mortar or parts of the chimney blocking the
chimney flue.
5. There should be a two inch clearance between any chimney (ma
-
sonry or metal) and combustibles. (such as the house)
6. The chimney should extend at least 2 foot above the highest point
of the house, or 2 foot above the point at which the chimney is 10
foot from the roof.
7. The chimney should be relatively straight and vertical.
8. The portion of an all-fuel metal chimney that extends above the
roof should be well secured.
9. A masonry chimney should be built on footings and not attached
to the house.
10. A rain cap, complete with an animal or bird screen, should be in
-
stalled on top of the chimney.
CREOSOTE - FORMATION AND NEED
FOR REMOVAL
When wood is burned slowly, it produces tar and other organic vapors,
which combine with expelled moisture to form creosote. The creosote
vapors condense in the relatively cool chimney flue of a slow-burning
fire. As a result, creosote residue accumulates on the flue lining. When
ignited, this creosote makes an extremely hot fire.
The chimney connector and chimney should be inspected at least twice
monthly during the heating season to determine if a creosote build-up
has occurred. If creosote has accumulated, it should be removed to
reduce the risk of a chimney fire.
SMOKE PIPE INSTALLATION
Clearances to combustible materials (i.e. paneling, ceiling tile, sheet rock,
plaster, draperies, casements or wood trim, etc.) will vary with the type
of flue connection used. Be sure to maintain the specified clearances
for your type of installation.
TYPE OF FLUE
REQUIRED
CONNECTION
CLEARANCE
24 Gauge or Heavier .................................................. 18”
Single Wall Stainless Steel
or Black Pipe
Double Wall, Stainless Steel or .................................. 6”
Double Wall, Black Pipe w/
Stainless Steel Inner wall
Class A 103HT All-Fuel or Equivalent ................... 2”
According to NFPA standards, single wall stove pipes can be within
9” of combustibles provided an approved fire retardant material cov
-
ered with 28 gauge sheet metal, spaced out 1” on non-combustible
spacers, is utilized. See illustration.
18” [46cm]
18” [46cm]
9” [23cm]
When using a Class A or double wall flue pipe connection, follow the
manufacturer’s instructions.
When constructing a single wall smoke pipe, the following guidelines
must be observed.
1. The connector pipe should be 24 gauge or heavier
stainless
steel or black pipe.
2. Secure all joints with three #8 screws.
3. If the connector pipe must pass through a wall, an approved insu
-
lated or ventilated thimble, at least three times the diameter of the
smoke pipe must be used. (i.e. a 6” diameter smoke pipe needs an
18” thimble).
4. The connector pipe should never be used as a chimney.
Summary of Contents for SF747
Page 2: ...2...
