Hi all.
I have so... many questions. I want to build a separator for my DC (craftex/grizzzly 2HP) and one for my shopvac.
I have (well will have) rectangular ducting 5"x10-12" (7"-8" equivalent pipe) and looking at 6-7" outlet pipe for the DC.
I currently have a canister filter, but I'm looking at venting outside - despite the fact that I live in Ottawa, Canada and the current temperature is a balmy 24℉ and Saturday is forecast for a high of 10℉! - more on that later.
So first diameter of separator. Bbased on what I have read 17" is too small for 5", vawoodworker84 made a 20" one for a 6" outlet. I am planning on using a 55 gal drum so up to 24" is easy. On the other hand bigger ones need more air, WayTooLate said he needed 1000CFM on a (presumably) 20-22" separator and 6" inlet/outlet (1000cfm is my target, but pushing what I can expect).
Is it really the amount of air or actually the speed? i.e. would I be better off narrowing/shortening the inlet size in order to speed up the air? If I am venting outside (I live in the country) maybe I don't care that much about fine dust but more about less pressure drop?
Next "simple" question is the question of slot width. Phil has said 1 1/8" slot seemed the right compromise. larger slots tend to allow more scrubbing to occur. Has anyone tried vertical baffles under the baffle to limit movement of air underneath the baffle to reduce this scrubbing?
Finally (for this round) has anyone - and I guess that means Phil - tried a slot in the wall instead of the baffle? I.E. an inside wall with a side slot inside a wall with a bottom slot.
thanks for any and all responses even guesses.
mike
I have so... many questions. I want to build a separator for my DC (craftex/grizzzly 2HP) and one for my shopvac.
I have (well will have) rectangular ducting 5"x10-12" (7"-8" equivalent pipe) and looking at 6-7" outlet pipe for the DC.
I currently have a canister filter, but I'm looking at venting outside - despite the fact that I live in Ottawa, Canada and the current temperature is a balmy 24℉ and Saturday is forecast for a high of 10℉! - more on that later.
So first diameter of separator. Bbased on what I have read 17" is too small for 5", vawoodworker84 made a 20" one for a 6" outlet. I am planning on using a 55 gal drum so up to 24" is easy. On the other hand bigger ones need more air, WayTooLate said he needed 1000CFM on a (presumably) 20-22" separator and 6" inlet/outlet (1000cfm is my target, but pushing what I can expect).
Is it really the amount of air or actually the speed? i.e. would I be better off narrowing/shortening the inlet size in order to speed up the air? If I am venting outside (I live in the country) maybe I don't care that much about fine dust but more about less pressure drop?
Next "simple" question is the question of slot width. Phil has said 1 1/8" slot seemed the right compromise. larger slots tend to allow more scrubbing to occur. Has anyone tried vertical baffles under the baffle to limit movement of air underneath the baffle to reduce this scrubbing?
Finally (for this round) has anyone - and I guess that means Phil - tried a slot in the wall instead of the baffle? I.E. an inside wall with a side slot inside a wall with a bottom slot.
thanks for any and all responses even guesses.
mike