Downflow Furnace |
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| Vent | 3 9/16" |
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| 1 7/8" |
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| Combustion |
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| Air Intake Pipe |
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Seal/Caulk |
| See Vent Table 4 |
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Around Pipe |
| Straps or Other Suitable | 3 1/2" |
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at Building |
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| Supports at Minimum of | 6" | |||
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| 5 ft. Intervals |
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90˚ Elbow | Coupling |
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| Top View |
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| Offset with | |
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| Vent for Adequate | |
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| Dimensional Clearance | |
12" |
| Upward Pitch - 1/4" Per Foot |
| Exhaust | |
Wall | Outlet Exhaust Vent |
| Vent | ||
Min. |
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| PVC or |
| First Support Should be as Close to |
| ABS pipe | ||
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| Furnace Connection as Possible |
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Normal Snow Level |
| Combustion Air | Furnace |
| 3" x 2" |
| Intake Pipe |
| Reducer | ||
Figure 16. Horizontal Venting
Combustion Air Intake Pipe
Support System
on Vertical Rise
Below Joints
First support should be as close to furnace as possible
5'
Vent
Vent
Upward Pitch
1/4" per foot
Combustion Air Intake Pipe 
Figure 17. Vertical Venting
5.Avoid areas where condensate drainage may cause problems by dropping on plant- ers or patios, etc. Also ensure that ex- haust gases will not impinge on windows or building surfaces, which may be com- promised or damaged by condensation. Do not install the vent terminal such that exhaust is directed into window wells, stairwells, under decks or into alcoves or similar recessed areas, and do not termi- nate above any public walkways.
6.Select the point of wall penetration where the minimum 1/4 inch per foot of slope up can be maintained.
!CAUTION:
For optimal performance vent furnace through wall which experiences the least exposure to winter winds.
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