DIRECT VENT - HORIZONTAL (CATEGORY III)
Figure 9.
TABLE 13. DIRECT VENT (HORIZONTAL EXHAUST CONFIGURATIONS)
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| APPLIANCE | CERTIFIED | EXHAUST | MAXIMUM | AIR INTAKE | AIR INTAKE | MAXIMUM | |
| MODEL | CATEGORY | EXHAUST VENT | VENT SIZE | EXHAUST VENT | MATERIAL | SIZE | AIR INTAKE | |
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| MATERIAL | INCHES (cm) | LENGTH FT (m) |
| INCHES (m) | LENGTH FT (m) | |
| I000 | III | STAINLESS | 10" | 35' | GAL. STEEL | 8" | 35' | |
| (SEALED) | (25.4 cm) | (10.7 m) | PVC, ABS OR | (20.3 cm) | (10.7 m) | |||
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| CPVC | ||||||
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1300 |
| STAINLESS | 12" | 35' | GAL.STEEL | 10" | 35' | ||
III | PVC, ABS CR | ||||||||
1500 | (SEALED) | (30.5 cm) | (10.7 m) | (25.4 cm) | (10.7 m) | ||||
| CPVC | ||||||||
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| STAINLESS | 14" | 20' | GAL. STEEL | 10" | 20' | |
1850 | III | PVC, ABS OR | |||||||
(SEALED) | (35.6 cm) | (6.1 m) | (25.4 cm) | (6.1 m) | |||||
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| CPVC | ||||||
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2100 |
| STAINLESS | 14" | 20' | GAL. STEEL | 12" | 20' | ||
III | PVC, ABS OR | ||||||||
(SEALED) | (35.6 cm) | (6.1 m) | (30.5 cm) | (6.1 m) | |||||
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| CPVC | ||||||
2500 |
| STAINLESS | 16" | 20' | GAL. STEEL | 12" | 20' | ||
III | PVC, ABS OR | ||||||||
(SEALED) | (40.6 cm) | (6.1 m) | (30.5 cm) | (6.1 m) | |||||
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| CPVC | ||||||
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WARNING: No substitutions of flue pipe or vent cap material are allowed. Such substitutions would jeopardize the safety and health of inhabitants.
•A maximum of two elbows can be used on inlet and outlet vent piping respectively. Each elbow is equal to 10 feet (3 m) of straight pipe.
•Use only special gas vent pipes listed for use with Category III gas burning heaters, such as stainless steel
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