Homemade Bellmouth

[Schreck]

This is an excerpt from a dust collector review that is no longer available on the Porter Cable website.

[phil (admin)]

Good stuff.

Running those large roundover bits in my table is a little on the exciting side, but I've done it.

[Schreck]

Here is an option that can be purchased at common retailers in the ductwork section.  Airflow increased by 10% when I added an un-modified 5" to 6" reducer fitting to the end of a 5" duct recently.  You could cut along the orange line and this would likely increase airflow further.  Measurements were made with a pitot tube and digital meter.  I will post details in a separate thread very soon.  Cheap and readily available, many sizes available, what's not to like?