Version 1.04
March 2011
APEX cbt
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Flue pipe sections must be attached to the furnace and
to each other with the crimped end toward the furnace
(Fig. 8). This allows creosote to run into the furnace and
not onto the outside of the pipe. All joints should be
secured with three metal screws. Otherwise, in the
event of a creosote fire, the connection may vibrate
apart. Horizontal lengths of flue pipe should have an
upward slope from the furnace of 1/4 inch per foot.
CONNECTION TO A MASONRY CHIMNEY
Should the furnace be connected to a masonry chimney, the chimney should be examined for cracks, loose
mortar, other signs of deterioration, and blockage. The furnace should not be installed until it is determined
that the chimney is safe for use. Since an oversized flue contributes to the accumulation of creosote, the
size of the flue should be checked to determine that it is not too large for the furnace. For this furnace it is
recommended that the flue size should not exceed the overall area of a 7” flue (38.5 square inches). The
chimney should also be checked to assure it meets the minimum standards of the National Fire Protection
Association (NFPA) Standard 211. Following is a list of the more critical minimum requirements for a
properly constructed chimney.
1.
The masonry wall of the chimney, if brick or modular block, must be a minimum of 4 inches nominal
thickness. A mountain or rubble stone wall must be at least 12 inches thick.
2.
The chimney must have a fire clay flue liner (or equivalent) with a minimum thickness of 5/8 inch and
must be installed with refractory mortar. There must be at least 1/2-inch air space between the flue liner
and the chimney wall (Fig. 9). An equivalent liner might be a listed chimney liner system or other
approved material.
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 one-inch clearance to the combustible structure. Fire
stops must be installed at the spaces where the chimney passes through floors and/or ceiling (Fig. 10).
Remember that insulation must not contact the chimney. There must be air space around the chimney.
Insulation must be 2 inches or more from the chimney (Fig. 11).
4.
A chimney must be the required height above the roof or other obstruction for safety and for proper draft
operation. The requirement is that the chimney must be at least 3 feet higher than the highest point
where it passes through the roof and at least 2 feet higher than the highest part of the roof or structure
that is within 10 feet of the chimney, measured horizontally (Fig. 12).
Minimum 2” clearance for
interior chimney
Fig.8 Flue Gas Direction
Fig. 9 Masonry Chimney Construction
Fig.10 Fire Stopping
INSTALLATION INSTRUCTIONS - VENTING
½”
Air Space
⅝”
Fireclay
Flue Liner
Chimney Wall
4” (Nominal)
Flue
Foundation
Содержание APEX CBT
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