Exterior Masonry Chimneys (Cat. I Furnaces Only); Checklist Summary; Check 1 - Proper Chimney Termination - Intertek MES80 Installation Instructions Manual

Exterior Masonry Chimneys
(Category I Furnaces Only)
An exterior masonry chimney is defined as a "Masonry"
chimney exposed to the outdoors on one or more sides
below the roof line." The ability to use a clay lined masonry
chimney depends on a parameter not associated with interior
chimneys. This variable is the geographic location of the
installation. Researchers have discovered that the winter
design temperatures have a direct impact on the suitability of
this type of venting. In most situations, the existing masonry
chimneys will require a properly sized metallic liner.
P
OSSIBILITY OF PROPERTY DAMAGE
DAMAGING CONDENSATION CAN OCCUR INSIDE MASONRY CHIMNEYS
-
WHEN A SINGLE FAN ASSISTED
)
FURNACE IS VENTED WITHOUT ADEQUATE DILUTION AIR
80%
CONNECT AN FURNACE TO A MASONRY CHIMNEY UNLESS THE
FURNACE IS COMMON VENTED WITH A DRAFT HOOD EQUIPPED
APPLIANCE OR THE CHIMNEY IS LINED WITH A METAL LINER OR
. A
METAL VENT LL INSTALLATIONS USING MASONRY CHIMNEYS MUST BE
SIZED IN ACCORDANCE WITH THE APPROPRIATE VENTING TABLES
80%
FURNACE IS COMMON VENTED WITH A DRAFT HOOD EQUIPPED
,
APPLIANCE THE POTENTIAL FOR CONDENSATION DAMAGE MAY STILL
EXIST WITH EXTREMELY COLD CONDITIONS
,
EXTERIOR CHIMNEYS OR ANY COMBINATION OF THESE CONDITIONS
T
HE RISK OF CONDENSATION DAMAGE IS BEST AVOIDED BY USING
MASONRY CHIMNEY AS A PATHWAY FOR PROPERLY SIZED METAL LINER
T B .
OR YPE METAL VENT
Throat
Clean Out
Typical Multiple Flue Clay Tile Chimney
WARNING
,
PERSONAL INJURY OR DEATH
C I (80% AFUE
ATEGORY APPLIANCE
. D
O NOT
,
LONG VENT CONNECTORS
Roof Line
Clay Tile Size: 8" x 8" x12"
(Each x 24" Length)
1/2" to 1" Air Space
Second Floor
Water Heater
Vent Connector
F.A.F. Vent
Connector
Natural Draft
Water Heater
Figure 6

Checklist Summary

This checklist serves as a summary of the items to be checked
before venting an 80+ furnace into a masonry chimney. In
addition, we recommend that a qualified serviceman use this
checklist to perform a yearly inspection of the furnace venting
system.
This checklist is only a summary. For detailed information
on each of the procedures mentioned, see the paragraph
referenced with each item.
Proper Chimney
Termination?
(Check 1)
Chimney channel
free of solid and
liquid fuel
T B
YPE
appliances?
(Check 2)
. I
F AN
,
.
Crown in good
condition
(Check 3)
Cleanout free of
(Check 4)
Liner in good
condition?
(Check 5)
Dilution air
available?
(Check 6)
Complete the
installation.
(Check 7)
11
Change venting
arrangements
Rebuild crown
debris?
Figure 7
(Fix 2)
(Fix 3)
and/or Reline
(Fix 4)
Reline
(Fix 4)
Reline
(Fix 4)
Reline
(Fix 4)