| Venting | Certified Venting | Vent Size | Maximum Vent | Combustion Air | Air Inlet | Max. Air | |
Model | Intake Pipe | Size | Intake Length | |||||
Category | Material | (inches) | Length (feet) | |||||
| Material | (inches) | (feet) | |||||
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| UL 1738 Certified |
| 35 | Galvanized |
| 35 | |
IV | Venting Material e.g. | 8 | Subtract 10 ft per | Steel | 6 | Subtract 10 ft | ||
w/CHX | elbow, Max. 3 | PVC, ABS | per elbow, | |||||
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| Steel PVC*, CPVC* |
| elbows | CPVC |
| Max. 3 elbows | |
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| |
|
| UL 1738 Certified |
| 35 | Galvanized |
| 35 | |
IV | Venting Material e.g. | 10 | Subtract 10 ft per | Steel | 6 | Subtract 10 ft | ||
w/CHX | elbow, Max. 3 | PVC, ABS | per elbow, | |||||
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| ||||||
|
| Steel PVC*, CPVC* |
| elbows | CPVC |
| Max. 3 elbows | |
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| |
|
| UL 1738 Certified |
| 35 | Galvanized |
| 35 | |
IV | Venting Material e.g. | 12 | Subtract 10 ft per | Steel | 8** | Subtract 10 ft | ||
w/CHX | elbow, Max. 3 | PVC, ABS | per elbow, | |||||
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| ||||||
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| Steel PVC*, CPVC* |
| elbows | CPVC |
| Max. 3 elbows | |
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*Contact the manufacturer for details.
**If the boiler is direct vented, a 6 to 8 in. adapter must be installed at the blower inlet.
Table R: Vertical Direct Venting with
Secondary Condensing Heat Exchanger
Vertical Direct Venting System With | Outdoor Installation with |
| Condensing Heat Exchanger |
(Category IV) Installation |
|
These installations utilize the boiler mounted blower to draw combustion air from outdoors and vent combus- tion products to the outdoors.
UL 1738 Certified Venting Material (e.g.
For certain installations, i.e. pool,
To prevent the condensation accumulation in the vent, it is required to install the horizontal portion of vent with a slight upward slope of not more than 1/4" per foot of horizontal run and an approved condensate trap must be installed per applicable codes.
WARNING: For common vent installations, contact the factory.
WARNING: No substitutions of flue pipe or vent cap material are allowed. Such substitutions would jeopardize the safety and health of inhabitants.
The Stainless Steel
Outdoor models are
Care must be taken when locating the outdoor unit because the flue gases discharged from the vent cap can condense as they leave the cap. Improper location can result in damage to adjacent structures or building finish. For maximum efficiency and safety, the follow- ing precautions must be observed:
a)Outdoor models must be installed outdoors and must use the
b)Periodically check venting system. The boiler’s venting areas must never be obstructed in any way and minimum clearances must be observed to prevent restriction of combustion and ventilation air. Keep area clear and free of combustible and flammable materials.
c)Do not locate adjacent to any window, door walk- way, or gravity air intake. The vent should be located four (4) feet horizontally from such areas.
d)Install above grade level and above normal snow levels.
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