4
18” [46cm]
18” [46cm]
9” [23cm]
mentioned above. Th
ey are safer and perform better than tra-
ditional masonry chimneys. If a masonry chimney is a must,
be certain it has a fi re 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. Th
e furnace should be the only heating using the chimney
fl ue . One furnace per fl ue outlet.
2. A masonry chimney should have a tile or stainless steel
liner.
3. Th
e masonry chimney should not have any missing mortar
or loose bricks.
4. Th
ere should be no mortar or parts of the chimney block-
ing the chimney fl ue.
5. Th
ere should be a two inch clearance between any chimney
(masonry or metal) and combustibles. (such as the house)
6. Th
e chimney should extend at least 2 foot above the high-
est point of the house, or 2 foot above the point at which
the chimney is 10 foot from the roof.
7. Th
e chimney should be relatively straight and vertical.
8. Th
e 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 installed 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 creo-
sote. Th
e creosote vapors condense in the relatively cool chim-
ney fl ue of a slow-burning fi re. As a result, creosote residue ac-
cumulates on the fl ue lining. When ignited, this creosote makes
an extremely hot fi re.
Th
e 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 fi re.
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 fl ue connection used. Be sure to maintain
the specifi ed clearances for your type of installation.
TYPE OF FLUE
REQUIRED
CONNECTION
CLEARANCE
24 Gauge or Heavier ........................................... 18” [45.7cm]
Single Wall Stainless Steel
or Black Pipe
Double Wall, Stainless Steel or .......................... 6” [15.2cm]
Double Wall, Black Pipe w/
Stainless Steel Inner wall
Class A 103HT All-Fuel or Equivalent ............ 2” [5.1cm]
According to NFPA standards, single wall stove pipes can be
within 9” of combustibles provided an approved fi re retardant
material covered with 28 gauge sheet metal, spaced out 1” on
non-combustible spacers, is utilized. See illustration.
When using a Class A or double wall fl ue pipe connection, fol-
low the manufacturer’s instructions.
When constructing a single wall smoke pipe, the following
guidelines must be observed.
1. Th
e 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 ap-
proved insulated or ventilated thimble, at least three times
the diameter of the smoke pipe must be used. (i.e. a 6” di-
ameter smoke pipe needs an 18” thimble).
4. Th
e connector pipe should never be used as a chimney.
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.
