The formula is too much like work.....

with a 4" diameter part the RPM equals the SFM, so if you need 100 SFM, use 100RPM.

For 2" diameter, use twice the speed. 1" use 4x. 1/2" use 8x speed. f you have an 8" diameter part, use half the speed, so 50 RPM to get 100SFM.

DONE.

It's the same information, but done by simple proportions.

with a 4" diameter part the RPM equals the SFM, so if you need 100 SFM, use 100RPM.

For 2" diameter, use twice the speed. 1" use 4x. 1/2" use 8x speed. f you have an 8" diameter part, use half the speed, so 50 RPM to get 100SFM.

DONE.

It's the same information, but done by simple proportions.

## Comment