What do you think of this idea:
I currently use a Delta 50-665 1 1/2 HP two stage barrel mounted collector. In orded to improve its efficiency I thought I would add a Phil Thein baffle to my collector, mounted below the existing barrel cover plate and then add a filter to replace the bag that currently is the fine collector.
An alternative would be to build a seperate pre-collector of the Phil Thein design on a 30 gallon drum. Then the ducting would go to the blower unit and exhaust through a filter.