A type B or listed chimney lining system that passes through an unused masonry chimney flue is not considered to be exposed to the outdoors.
General Venting Requirements
Vent all EL180UHE furnaces according to these instruc tions:
1 - Vent diameter recommendations and maximum allow able piping runs are found in the provided venting tables.
2 - In no case should the vent or vent connector diameter be less than the diameter specified in the provided venting tables.
3 - The minimum vent capacity determined by the sizing tables must be less than the low fire input rating and the maximum vent capacity must be greater than the high fire input rating.
4 - Single appliance vents - If the vertical vent or tile‐lined chimney has a larger diameter or flow area than the vent connector, use the vertical vent diameter to de termine the minimum vent capacity and the vent connector diameter to determine the maximum vent capacity. The flow area of the vertical vent, however, shall not exceed 7 times the flow area of the listed ap pliance categorized vent area, drafthood outlet area or flue collar area unless designed according to approved engineering methods.
5 - Multiple appliance vents - The flow area of the largest
section of vertical vent or chimney shall not exceed 7 times the smallest listed appliance categorized vent area, drafthood outlet area or flue collar area unless de signed according to approved engineering methods.
6 - The entire length of single wall metal vent connector shall be readily accessible for inspection, cleaning, and replacement.
7 - Single appliance venting configurations with zero lat eral lengths (table 3) are assumed to have no elbows in the vent system. For all other vent configurations, the vent system is assumed to have two 90° elbows. For each additional 90° elbow or equivalent (for example two 45° elbows equal one 90° elbow) beyond two, the maximum capacity listed in the venting table should be reduced by 10% (0.90 x maximum listed capacity).
8 - The common venting tables (4 and 5) were generated using a maximum horizontal vent connector length of
TABLE 2
Connector Diameter | Maximum Horizontal |
inches (mm) | Connector Length feet (m) |
|
|
|
|
3 (76) | |
|
|
4 (102) | 6 (1.83) |
|
|
5 (127) | |
|
|
6 (152) | 9 (2.74) |
|
|
7 (178) |
Common Venting Using
MINIMUM LENGTH = AS SHORT AS PRACTICAL. FOR MAXIMUM LENGTH SEE NOTE TO LEFT
INTERIOR
NOTE- Refer to provided venting tables for installations.
OTHER
APPLIANCE
VENT
CONNECTOR
NOTE - the chimney must be properly sized per provided venting tables or lined with listed metal lining system.
PERMANENTLY
SEALED FIREPLACE
OPENING
FURNACE
FIGURE 24
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