LAARS Mighty-Stack TL00-199 - Installation, Operation and Maintenance Instructions - Manual (Page 8)

LAARS HEATING SYSTEMS Page 8
material used. This will maintain the clearances and
prevent physical damage and separation of the joints.
NOTE: Always provide a minimum clearance of
6 inches between a Type C vent pipe and any
combustible materials.
Warning
Single-wall vent pipe must never pass through
interior walls, or through floors or ceilings! Failure to
comply with this warning could result in a fire,
causing property damage, personal injury, or death!
When installing the vent system, all applicable
national and local codes must be followed! If you
install thimbles, firestops or other protective devices,
and they penetrate any combustible or noncombustible
construction, be sure to follow all applicable national
and local codes.
If a vertical vent is installed, follow the code
requirements for Category 1, Fan Assisted Appliances.
Follow the requirements as indicated in the latest
edition of ANSI Z223.1/NFPA 54. See “Sizing of
Category I Venting Systems” and “Appendix G.” In
Canada, follow the instructions in the CAN/CGA-
B149 installation code.
An unused chimney can be used as a raceway for
a single-wall vent pipe. (See Figure 6). Never run a
vent pipe through a flue that has another appliance
attached to it.
(b) Vent Termination
A listed vent terminal must complete the vertical
run where it exits the chimney. This must be designed
for the type of pipe being used. The vent pipe must
extend at least 3 feet (1 m) above the highest point
where it passes through the roof. In addition, the vent
cap must be at least 2 feet (0.6 m) higher than any part
of a building within a horizontal distance of 10 feet (3
m). Clearance to any combustible materials must be
maintained as listed. (See Figure 7).
1L. Horizontal Venting – Category III
When a vent system is horizontal or cannot meet
the requirements of Category I, it can develop positive
pressure. This type of system must be installed in
accordance with the instructions in this section, and
with the instructions supplied by the vent
manufacturer.
(a) Vent connections
The vent system must be gas tight. All seams
and joints must be sealed with silicone sealant or
adhesive tape having a minimum temperature rating of
400°F (204°C). (See Table 6 for a list of approved
sealing materials).
For best results, a horizontal vent system should
be as short and straight as possible. The materials used
in the vent connectors should be as listed in Table 7.
Description Manufacturer Product
High Temperature
RTV Dow Corning Trade Mate
2" (51 mm) wide
aluminum foil tape, Venture Product #3243
backed with adhesive
2" (51 mm) wide
aluminum foil tape 3M Product #433
backed with adhesive
Table 6. Vent Sealing Material.
In USA: Up to a maximum of
Use UL type 304, 316 or 40 feet (12 m) of equiv-
29-4C stainless steel, alent pipe run (including
26 gauge minimum. required elbows).
In Canada:
Use “BH” vent type
complying with ULC
S-636 Standard.
Table 7. Vent Connector Materials.
Figure 6. Vertical Venting.