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DRAFT REQUIREMENTS
Draft is the force which moves air from the appliance up through the
chimney. The amount of draft in your chimney depends on the length of
the chimney, local geography, nearby obstructions and other factors. Too
much draft may cause excessive temperatures in the appliance and may
damage the catalytic combustor. Inadequate draft may cause backpuffi ng
into the room and `plugging' of the chimney or the catalyst."
Inadequate draft will cause the appliance to leak smoke into the room
through appliance and chimney connector joints.
An uncontrollable burn or excessive temperature indicates excessive draft.
THE CHIMNEY SYSTEM
Chimney Installation Notes
1. This appliance is equipped with a universal vent collar that will require
the fi rst vent section of pipe to be secured with four screws to the
collar (equally spaced around circumference).
2. If possible, install an interior chimney as it will provide better perfor-
mance. In areas with continuous temperatures below 0°F (-18°C),
the use of an exterior chimney increases the likelihood of operating
problems such as low draft, high rate of creosoting, and poor start-up
characteristics. Exterior chimneys are also prone to down-drafting
and fl ow reversal. Installations, which are located on lower fl oors
in the house, such as in a basement, in combination with outside
chimney, are especially prone to fl ow reversal.
3. The model WRT4826WH fi replace is listed only with Security Chim-
neys International Ltd. 7" diameter chimney systems models ACBI
or ASHT+
*
or S2100+
systems
**
.
NOTE: Use of ACBI
*
chimney with these fi replaces require the use
of a starter section used at the fi replace top collar. Use ACBI7SBA
or ACBI7SBA30
*
.
4. A chimney venting a fi replace shall not vent any other appliance.
5. The minimum chimney height is 12 feet (3.7 m). In altitude, add 18"
(450 mm) to the chimney for every 2000 feet (600 m) above sea
level.
6. All chimney installations must include at least one support. The
maximum chimney length that can be supported by the fi replace
is 20 feet (8m) for ACBI
chimney.
7. The chimney must extend at least 3 feet (915 mm) above its point of
contact with the roof and at least 2 feet (610 mm) higher than any
wall, roof or building within 10 feet (3m) of it (see Figure 21).
18
®
*
or DuraVent model DuraTech
DTC chimney
*
chimney and 12 feet (3.7 m) for ASHT+
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
8. If the chimney extends higher than 5 feet (1500 mm) above its point
of contact with the roof, it must be secured using a brace and guy
wires.
9. A rain cap must be installed on top of the chimney. Failure to install
a rain cap may cause corrosion problems.
10. Portions of the chimney which may extend through accessible spaces
must be enclosed to avoid contact with combustible materials or
damage to the chimney.
two (2) feet Min.
ten (10) feet
Figure 21
NOTE: 2" clearance to combustibles around chimney components required.
*
NOTE: Blown or fi ll type insulation materials must not be in contact with
the fi replace or in the enclosure frame as described in ''Enclosure'' section.
NOTE: Local codes may not require fi restopping at the ceiling levels for
outside chase installations. However, it is recommended for safety and
the reduction of heat loss.
*
*
three (3) feet Min.
*
Available from Security Chimneys™
**
Available from DuraVent
®
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