W1816 Owner's Manual (Mfg. Since 10/09)
3.Directional changes should be kept to a minimum. The more directional change fittings you use directly increases the overall resistance to airflow.
OPERATIONS
4.Gradual directional changes are more efficient than sudden directional changes (i.e. use the largest corner radius possible when changing hose or pipe direction).
5.Each individual branch line should have a blast gate immediately after the branch to control suction from one machine to another.
6.The simpler the system, the more efficient and less costly it will be.
Step 4: Determine CFM of Each Machine
Since each machine produces a different amount of sawdust, the requirements for the minimum amount of air flow or CFM (cubic feet per minute) to move that sawdust is unique to the machine (for example, a planer produces more sawdust than a table saw). Knowing this required CFM is important to gauging which size of duct to use.
The chart in Figure 40 will give you a close estimation of the airflow your machine requires. Keep in mind that machines that generate the most sawdust should be placed closest to the dust collector. If the machine has multiple dust ports, the total CFM required is the sum of all ports.
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| Machine | Approximate |
| Dust Port Size | Required CFM |
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| 2" | 98 |
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| 2.5" | 150 |
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| 3" | 220 |
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| 4" | 395 |
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| 5" | 614 |
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| 6" | 884 |
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| 7" | 1203 |
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| 8" | 1570 |
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| 9" | 1990 |
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| 10" | 2456 |
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