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8.3 Horizontal Venting | FIGURE 20: Tube Termination |
In noncombustible walls only, vent terminal (P/N
For 4" (10 cm) vents in either combustible or noncombustible walls, use Tjernlund
For 6" (15 cm) common vents in either combustible or noncombustible walls, use Tjernlund
8.4 Vertical Venting
For 4" (10 cm), an approved vent cap (P/N 90502300) must be used.
For 6" (15 cm) common vent, an approved vent cap (P/N 90502302) must be used.
For common vertical venting of more than two heaters, See Page 34, Section 8.10.
A vent shall not extend less than 2' (.6m) above the highest point where it passes through a flat roof of a building.
8.5 Unvented Operation Tube Termination
Turndown type vent terminal with a screen must be installed at the exhaust end of the tube. Vent terminal design shall not incorporate backdraft flap.
8.6 Length Requirements
The maximum vent length allowed is 45' (13.7 m). The maximum outside air supply duct length allowed is 45' (13.7 m).
The total vent length, plus outside air duct length and any extensions to minimum heat exchanger lengths, cannot exceed 65' (19.8 m).
Vent length should be limited to less than 20' (6 m). If using extended heater lengths or vent lengths greater than 20' (6 m), condensation will form in the vent pipe. Insulation and additional sealing measures (high temperature silicone at all seams) are required. Optional heat exchanger beyond minimum lengths are considered as vent length for length determination.
Subtract 15' (4.6 m) of maximum allowed vent or duct length per vent elbow if more than two are used.
8.7 Horizontal Ventilation 4" (10 cm) Pipe
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| SIDE VIEW |
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| Combustible or |
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Vent Adapter |
| Vent Adapter | |
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| 18" (46 cm) | |
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| Min. |
4" (10 cm) |
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Single Wall Pipe |
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| Vent Terminal |
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| 4" (10 cm) Single Wall Pipe | |
| Vent Terminal |
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Description | Part Number |
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Vent Terminal (Comb. Wall) | 90502100 |
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Vent Terminal |
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