J. Phil Thien's Projects

So I am trying to iron out the last few details on a tophat for a 55gal drum.

Inlet is the 10"x 4" to 6" round HVAC fitting going into a chamber that is 18" tall and 20" in diameter. The base has an oversized slot and 4 large holes in the middle for light to go into the bin below. On top of that base will be an acrylic disk to cover the slot and holes. My thinking is I can start with a narrow dust slot and tune it. Outlet to the blower is 6" and will have a bellmouth and straightener mimicking Retired's design.

Am I wrong in putting the inlet fitting as close to the top of the baffle as possible?

How far down should I start the bellmouth with a chamber this large?


Going to attempt to upload a drawing of where I am so far.

I have done a lot of looking at Bill's site and the only thing I readily found was that the radial impellers are very loud. Being quiet would be nice, but if that is the only benefit I don't think I would go through the effort or making a different impeller fit my setup. I have seen some charts showing pressure curves for different impeller designs, but they have all been in systems moving non-compressible fluids. I think I am going to stick with what I have and focus on the separator design and circle back to the impeller if I can't get results I like.

I am canabalizing a G1029Z dust colelctor for my setup and had a question about the benefit of an impeller upgrade. The stock impeller is just a hair shy of 12" by my measurements and I can't fit much larger in the housing without some significant modifications to it. The blades are not curved in either direction, radial I think it the correct term for this style. I see a lot of information on the benefits forward vs reverse curved blades. Are straight blades a significant downgrade to either of the curved options?

Thanks all.

Hello,

Amature woodworker and longtime guest lurker on the forum. I am trying to expand my hobby into hopefully a post retirement business. Currently redesigning my shop for better efficiency and space for a real dust collection system. 

Looking forward to plagerizing everyones good ideas for the benefit of my lungs.