I'm sorry I can't quantify the improvement. I've recently moved so much
of my "stuff" is still packed but the improvement was very noticeable.
I flew out and visited Oneida when I was designing my dust collector
and, as an engineer, was quite impressed with their hardware and
engineering competence.

RB

Jay Chan wrote:
Just replacing the impeller with one from Oneida
will make a tremendous improvement.


I also see the same recommendation in one of the dust collection book.
How's your result after you have replaced the original 11" impeller
with 12" impeller?


Somewhere I have a copy of the fan
curve for their impeller. When I come across it I'll share it. I do
recall that when I made measurements on my system several years ago
Oneida's data was conservative.


Thanks in advance for sharing the fan curve if you can find it.

Jay Chan