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Step 4: determine cfm of each machine – Woodstock SHOP FOX W1816 User Manual

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W1816 Owner's Manual (Mfg. Since 10/09)

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3. Directional changes should be kept to a minimum.

The more directional change fittings you use directly

increases the overall resistance to airflow.

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.

Machine

Dust Port Size

Approximate

Required CFM

2"

98

2.5"

150

3"

220

4"

395

5"

614

6"

884

7"

1203

8"

1570

9"

1990

10"

2456

Figure 40. Approximate required airflow

(CFM) based on machine dust port

diameter.