[NewMontanaWorkshop]

I have one that I built into the outfeed of one of my tablesaws. Simply a piece of 3/4" ply with holes drilled at 1-1/2" centers, then used the plunge router with a chamfer bit to soften the drilled holes.

It is currently hooked up to my HF dust collector, but I'm thinking I'll get better airflow if I pull the air cleaner down from the ceiling and mount the 'punched hole' top on that. The squirrel cage fan inside the air cleaner should pull more than enough air through the holes for effective dust containment.

Total cost...
$25 from a HVAC shop for a used furnace squirrel cage fan (4 speed).
$4 for some connectors and a bit of wire for the furnace fan.
Wood -- pretty much free, built from 'other peoples trash'.....

 

[NewMontanaWorkshop]

Going to be hard to get a shop-vac to pull enough volume I'm thinking.
Even my dust collector was not pulling enough to suck the dust off the table between the holes, although it did keep most of the airborn dust from leaving the top of the table.

The HVAC fan should pull enough air to do both -- along with filtering the air before recycling it back into the shop.

Hope that info helps.