DIRECT VENT - HORIZONTAL (CATEGORY III)
Figure 8.
TABLE 10. DIRECT VENT (HORIZONTAL EXHAUST CONFIGURATIONS)
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| APPLIANCE | CERTIFIED | VENT | MAXIMUM | AIR INTAKE | AIR INLET | MAXIMUM |
| MODEL | CATEGORY | EXHAUST VENT | SIZE | VENT LENGTH | MATERIAL | SIZE | AIR INTAKE |
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| MATERIAL | (INCHES) | (FEET) |
| (INCHES) | LENGTH(FEET) |
| 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) | ||
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| 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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