Ideal material and cross-sectional shape for HF Thien separator?

[Kooshball]

I am new here but as anyone who has done any research on how to improve the DC on a HF machine I am well aware of this site.

I am getting ready to make a Thein lid to be installed below my Wynn filter in my 2hp HF dc.  That said, is there an ideal thickness (and thus material type) for the separator used in this location?  Is thinner or thicker better?  Also, is the an ideal cross-sectional shape for the separator disk such as a trapezoid, to facilitate smoother airflow up into the filter?

Thanks in advance.

[phil (admin)]

Thin, and flat.

I used 1/8" and 1/4" hardboard (smooth both sides).

[Kooshball]

Thanks!

So even in that environment the 1/8" will work, nice.