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For Category I Gas Burning Appliances:
Follow these
Main Instructions
and the
Supplemental Category I
gas appliance instructions on page 9 of this booklet. Refer
to Heat-Fab's
Saf-T Vent Planning & Preparation Manual
for additional
considerations.
For Category III, IV Gas Burning Appliances:
Sections of flue gas conduit must be
sealed with a special sealant. Follow these
Main Instructions
, the
Supplemental
Category III and IV
gas instructions (PI-VSUP) packed with the Saf-T Vent elbows
or tees, and the appliance manufacturer's instructions.
MAIN INSTRUCTIONS
PRE-INSTALLATION INSPECTION
I
t is the installer's sole responsibility to inspect and verify the suitability of
the chimney and related construction for installation of this product.
Saf-T Vent is intended for installation in new or existing masonry chimneys which
comply with the requirements of
Chimneys, Fireplaces, Vents and Solid Fuel
Burning Appliances (NFPA 211)
.
The chimney must be composed of solid masonry
units, such as bricks or concrete block, at least 4 inches (nominal) in thickness. The
chimney must extend at least 5 feet above the highest appliance draft hood or flue
collar, with a maximum height of 60 feet. The chimney must extend at least 3 feet
10 feet
2 feet
Figure 1
Connect the base assembly, assemble lengths of conduit, lower the liner down the
chimney, mount the liner to the appropriate support system, and install the termination
assembly as described in the
Main Instructions
in this document.
INSTALL THE VENT CONNECTOR
If the vent connector is to be sections of Saf-T Vent flue gas conduit or generic single-*
wall metal pipe, attach the conduit connector adapter, which has the female fitting on
each end, to the male tee or elbow take off. If the vent connector is to be sections of
Type B or Type L vent pipe, attach a slip section instead of the connector adapter. The
slip section can be trimmed to the necessary length. Regardless of connector type, it
must slope upward toward the chimney at least 1/4 inch per foot.
To close off the hole in the chimney, attach a cover plate. Slip the cover plate over the
connector adapter or slip section and secure it to the face of the chimney with Tapcon
®
screws, masonry anchors or other appropriate fasteners. The cover plate may be
trimmed to meet the chimney dimensions. However, the installation must be such that
the important safety label on the cover plate is not disturbed and is readily visible to
the homeowner. The cover plate and attached label are a mandatory part of the
installation.
If the vent connector is to be sections of Saf-T Vent conduit or other single-wall metal
connector pipe, attach the male end of the first section to the connector adapter and
continue with straight sections and elbows back to the appliance. When used as a vent
connector the flue gas conduit is installed with the male ends up, pointing toward the
chimney. Connect the flue gas conduit to the appliance flue collar by cutting or
bending the tabs out of the way, and securing it with sheet metal screws. The connector
may be easily disconnected from the connector adapter for inspection of the flue.
If Type B, Type L or other double-wall construction vent pipe is used for the
connector, slide the pipe several inches over the slip connector and secure it with sheet
metal screws. Continue with pipe sections back to the appliance, following the vent
manufacturer's instructions.
Be sure that the connector has proper clearance to combustibles and conforms with
the requirements of the appliance manufacturer's instructions,
NFPA 54
, and local
codes. Since Saf-T Vent may only be used to vent appliances which are Listed for use
with Type B vent, Saf-T Vent sections or other single-wall metal pipe used as a
connector may be installed with a 6-inch clearance to combustibles. If Type B or Type
L pipe is used as a connector, it may be installed at its Listed clearance. Clearances
may be reduced if the combustible material is protected in accordance with Table
6-5.1.2 of
NFPA 211 (1996)
or Table 6.2.3(b) in
NFPA 54 (1999)
.
Thoroughly clean the chimney of combustible deposits. Particular attention should
be given to deposits of tar glaze creosote, which may be resistant to normal cleaning
methods. Remove any mortar projections or snags from the interior wall of the
chimney. Heat-Fab strongly recommends that an internal inspection be done with
video inspection equipment such as a Chim-Scan
TM
.
There must be a 1-inch minimum airspace clearance from combustible material
surrounding the masonry chimney. However, under certain conditions Saf-T Vent
may be used in chimneys in which combustible material comes in contact with the
outer surface. See the appropriate supplemental instructions for optional minimum
clearances. Combustible material must not be embedded or otherwise penetrate the
above the point where it
penetrates the roof, and 2 feet
higher than any part of a structure
within 10 feet (Figure 1).
Inspect the interior of the chimney
for loose or missing mortar, holes,
and cracked, loose or missing
bricks or unused thimbles. Repair
any defects in the chimney.
3 feet
