353AAV
MAXIMUM ALLOWABLE EXPOSED VENT PIPE LENGTH - FT (M) WITH AND WITHOUT INSULATION IN WINTER DESIGN TEMPERATURE AMBIENT*
| WINTER DESIGN | MAX PIPE | WITHOUT | WITH | |
FURNACE SIZE | TEMPERATURE | DIAMETER | INSULATION | INSULATION† | |
| °F 〈°C) | IN (mm) | FT (M) | FT (M) | |
| 20 | 1.5 (38) | 51 (16) | 70 (21) | |
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| 0 | 1.5 (38) | 28 (9) | 70 (21) | |
040 | 1.5 (38) | 16 (5) | 70 (21) | ||
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20 | 2 (51) | 45 (14) | 70 (21) | ||
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| 0 | 2 (51) | 22 (7) | 70 (21) | |
| 2 (51) | 10 (3) | 58 (18) | ||
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| 20 | 2 (51) | 65 (20) | 70 (21) | |
060 | 0 | 2 (51) | 35 (11) | 70 (21) | |
| 2 (51) | 20 (6) | 70 (21) | ||
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| 20 | 2 (51) | 55 (17) | 55 (17) | |
| 0 | 2 (51) | 48 (15) | 55 (17) | |
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080 | 2 (51) | 30 (9) | 55 (17) | ||
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20 | 2.5 (64) | 70 (21) | 70 (21) | ||
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| 0 | 2.5 (64) | 47 (14) | 70 (21) | |
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| 2.5 (64) | 28 (9) | 70 (21) | ||
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| 20 | 2.5 (64) | 40 (12) | 40 (12) | |
| 0 | 2.5 (64) | 40 (12) | 40 (12) | |
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100 | 2.5 (64) | 38 (12) | 40 (12) | ||
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20 | 3 (76) | 70 (21) | 70 (21) | ||
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| 0 | 3 (76) | 50 (15) | 70 (21) | |
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| 3 (76) | 28 (9) | 70 (21) | ||
| 20 | 3 (76) | 70 (21) | 70 (21) | |
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| 0 | 3 (76) | 61 (19) | 70 (21) | |
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120 | 3 (76) | 37 (11) | 70 (21) | ||
20 | 4 (102) | 70 (21) | 70 (21) | ||
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| 0 | 4 (102) | 48 (15) | 70 (21) | |
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| 4 (102) | 23 (7) | 70 (21) | ||
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*Pipe length ft (M) specified for maximum pipe lengths located in unconditioned spaces. Pipes located in unconditioned space cannot exceed total allowable pipe length as specified in Table.
† Insulation thickness based on R value of 3.5 per in.
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