•Do not exceed the length of duct pipe for the number of elbows shown in the chart below. Doing so can cause an accumulation of lint, increase drying time, and create a Þre hazard.
•Two 45° elbows equal one 90° elbow.
| Recommended Maximum Exhaust Length | ||||||
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| Exhaust Hood Types | ||||||
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| Recommended |
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| Use Only For Short Run | ||
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| Installations |
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| 4" |
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| 4" |
| (10.2 CM) |
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| DIA. |
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| (10.2 CM) | ||
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| DIA. |
| 4" |
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| (10.2 CM) |
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| DIA. |
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| 2½" |
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| 4" |
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| (6.4 CM) | |||
| (10.2 | CM) | |||||
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No. of 90° Elbows | Rigid Metal |
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| Rigid Metal | ||
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0 | 90 feet |
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| 60 feet | ||
1 | 60 feet |
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| 45 feet | ||
2 | 45 feet |
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| 35 feet | ||
3 | 35 feet |
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| 25 feet | ||
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•All joints should be tight to avoid air leaks. The male end of each section of ducting must point away from the dryer.
• Use clamps or duct tape to connect and seal all joints. Do not connect with screws or other fasteners that extend into the interior of the duct as they will create a collection point for lint.
Clamp
•Avoid running the exhaust system through an unheated area as this will cause condensation to form inside the duct and accelerate the rate of lint accumulation.
•Avoid running the exhaust system vertically through a roof as this may expose the exhaust system to down drafts, causing an increase in air restriction.
•Avoid sagging, compression or crimping of the exhaust system as this will result in reduced airßow and poor dryer performance.
•Do not screen the end of the exhaust system. Lint will accumulate and eventually clog the screen. Use an approved exhaust hood to terminate the duct outdoors.
12
