inlet port

[wannabedivin]

I have a couple of more questions.  I did some searching and am even more confused than ever.  I am building a top hat, 8 inches tall on a 22 inch barrel

1.   It is my understanding that the inlet port should be about halfway on "non slotted" portion of the baffle.  Am I correct
2.  Should the inlet tube be inside the unit ( I read it would interfere with the air flow)
3.  Should the inlet be square or round.  Saw lots of arguments for both
4.  Finally, is there a reason I should not use OSB if I put the smooth side inside the unit

[alan m]

1 i put my inlet  so that all the incomming air and dust will come straight onto the solid  part of the baffel. you dont want any of that  air going under the baffel and lifting any setled dust

2 make sure you inlet is NOT inside the seperater . it will cause turfulance and effect the eficiency. having it back a bit is no harm

3 there is nothing wrong with round , it works. just not as well as a square inlet. the square (or better yet a rectangle )  will allow a lot more of the air and dust to be entering at the wall of the seperater . this will keep it away from the outlet  and mean that it will softly meet the wall and not bang hard into it.

4 i dont think osb would be a problem. i would sand the indide to smothen it a bit . i would also seal it (i would do this anyway to most seperaters) with thined out coats of poliurithane varnish.
this should seal up any little pores in the osb